Formstack outage history

We're aware of the critical PHP vulnerabilities disclosed by the PHP project on October 21, 2026. Like much of the web, some of our services use PHP, and our Engineering and Security teams began working on this as soon as the advisory was announced. Here's where things stand: - We're preparing to apply the security updates and have put additional protective measures in place in the meantime. - We're actively monitoring our environment, and to date we haven't identified any evidence that these vulnerabilities have been exploited or that customer data has been accessed. - No action is required on your part. - We don't expect service disruption. If any maintenance is needed, we'll post it here in advance. We'll share our next update here as things progress. Subscribe to this page to get updates as they're posted.

Streamline: Update - October 21, 2026, 2:23 PM ET We've completed applying the PHP security updates to Intellistack Streamline as of 2:23 PM ET. Work on the other affected services is underway, and we'll post an update here as each is completed.  Our Engineering and Security teams are continuing to monitor our environment closely.  To date, we haven't identified any evidence that these vulnerabilities were exploited or that customer data was accessed. No action is required on your part.

Formstack Forms: Update - October 21, 2026, 7:15 PM ET We've completed security updates for Formstack Forms across both our US and AU environments. The updates were applied and validated as of 7:15 PM ET on October 21. Streamline and the Formsite public website were updated earlier today, and work on Formstack Documents and Formstack Admin is underway. Our monitoring still shows no evidence that these vulnerabilities were exploited or that customer data was accessed. No action is required on your part. We'll post our next update as each remaining service is completed. Subscribe to this page to get notified as updates go out.

Update - October 21, 2026, 7:55 PM ET We've completed applying the PHP security updates to Formstack Admin console (account sign-in and management) as of 7:55 PM ET. Here's where things stand: Formsite: The Formsite application doesn't use PHP and wasn't affected. Our public formsite.com website was updated as of 12:47 PM ET. Streamline: Updated as of 2:23 PM ET Formstack Forms: Updated as of 7:15 PM ET Formstack Admin: Updated as of 7:55 PM ET Formstack Documents: Updates are being validated and will be rolled out next. Our Engineering and Security teams are continuing to monitor our environment closely. To date, we haven't identified any evidence that these vulnerabilities were exploited or that customer data was accessed. No action is required on your part. We'll post another update here as each remaining service is completed.

Update - October 21, 2026, 10:51 PM ET We've completed applying the PHP security updates to Formstack Documents as of 10:51 PM ET. With this update, security updates are now complete across all affected services. Here's the final status: Formsite: The Formsite application doesn't use PHP and wasn't affected. Our public formsite.com website was updated as of 12:47 PM ET. Streamline: Updated as of 2:23 PM ET Formstack Forms: Updated and validated in both our US and Australia regions as of 7:15 PM ET Formstack Admin console (account sign-in and management): Updated as of 7:55 PM ET Formstack Documents: Updated and verified as of 10:51 PM ET All times above are October 21, 2026. Our Engineering and Security teams will continue to monitor our environment. To date, we haven't identified any evidence that these vulnerabilities were exploited or that customer data was accessed. No action is required on your part; there's nothing to install, patch, or configure on your end. We will complete our post-update monitoring and will post any additional updates here if warranted.

We identified an issue that caused some Formstack Sign documents to be finalized and delivered without an audit trail. The issue affected documents on October 8 from 7:42 PM to 9:31 PM ET. The signing process has recovered, and newly completed documents are processing normally. We are implementing a recovery script to restore the missing audit trails for affected documents. As part of this recovery process, some customers may receive a duplicate notification that their document has been finalized. If you previously received this notification, no action is required, and the duplicate message can be disregarded. We apologize for the inconvenience.

We have identified an issue causing some Formstack Sign integrations, including Documents-to-Sign deliveries, to lose authentication unexpectedly. Affected deliveries may fail with an authentication error, even if the connection was recently reauthenticated. Our Engineering team is actively working to deploy a permanent fix. We will provide another update as soon as the fix has been released.

A fix has been deployed to prevent Formstack Sign connections from losing authentication unexpectedly, and we are monitoring the results. We are also working to automatically restore authentication for previously affected connections. Customers who need to resume processing immediately may manually reauthenticate their Formstack Sign connection. We will provide another update once the restoration process is complete.

The issue causing some Formstack Sign connections to lose authentication unexpectedly has been resolved. A fix has been deployed, and authentication has been restored for affected connections. Customers should now be able to process Documents-to-Sign deliveries normally. If you continue to receive an authentication error, please reauthenticate your Formstack Sign connection and retry the delivery. Thank you for your patience while we worked to resolve this issue.

We are investigating an issue affecting some Formstack Documents workflows that use Formstack Sign. Although signing completes successfully, subsequent deliveries including Salesforce, SharePoint, and webhooks may not be released and may remain in a delayed status. Our team is actively working to resolve the issue. We will provide additional updates as they become available.

The issue has been identified and a fix is being implemented.

We have narrowed this issue down to Delayed Deliveries in Documents, when a delivery to Formstack Sign is included. If a document is sent to Sign and it is subsequently completed, Documents is not getting the file back and therefore not delivering it to the next step, such as Salesforce, Sharepoint, etc.

A fix has been deployed that has solved these delayed deliveries. The issue was that Formstack Sign was not sending the Formstack Documents product the notification that document was completely signed (i.e.: Finalized). We are now working on a script in Formstack Sign to send all those notifications back to Documents, so delayed deliveries should start processing soon.

This issue is resolved. All new Delayed Deliveries involving Formstack Sign should now be running as expected. In addition, all the signed documents notifications have been sent to Formstack Documents for stalled documents.

We are investigating reports that some Formstack Sign customers are unable to send documents through the API. Affected requests may return a “Request requires authentication” error despite successfully generating an access token. Some customers may also see a null API secret within their account. Our team is actively investigating and will provide additional updates as more information becomes available.

The issue has been identified and a fix is being implemented.

A fix has been implemented and we are monitoring the results.

All known issues with the Sign API and our authentication migration are now resolved and complete.

Formstack Documents with document deliveries to Formstack Sign are failing as of 11:19pm Eastern on Monday Sept 28. We are investigating the issue and will update accordingly.

A fix has been deployed and deliveries should be back up and running. We will monitor the results for some time and report back.

Incident resolved. Documents deliveries to Formstack Sign were failing from approximately 11:15 pm Eastern time, and successful deliveries were restored at approximately 1:35 am Eastern time. Many deliveries will auto-retry. However, customers should review their deliveries in the Formstack Documents interface to ensure no action is required.

Future: At approximately 9:30 pm Eastern Time on Monday September 28th, Formstack Sign will undergo a migration to ensure faster and more reliable user authentication. There is no risk to documents in flight, and no risk of account data loss. There could be a small interruption to user sessions during the migration, which is expected to take nearly two hours.

This migration work has begun and is progressing smoothly.

The Sign migration is nearly complete and we are in the testing phase. Users of Sign should see normal operation. All documents in flight continued to get signatures throughout the migration. There was a short period of time where users would not have been able to log into Formstack Sign from about 12:15 to 12:30am Tuesday morning 9/29.

The Formstack Sign migration has been completed and all systems are operational.

We have identified an issue affecting Workflows that use repeating sections configured to be hidden. In some cases, these sections are displaying an error and are not hiding as expected. Our Engineering team has identified the issue and is working on a resolution.

This incident has been resolved.

We have identified an issue causing some users to receive a validation error when entering a phone number in the Phone Number field on Forms. Our team has identified the cause and is working to resolve the issue.

A fix has been implemented for the issue causing some users to receive a validation error when entering a phone number in the Phone Number field on Forms. We are monitoring to ensure the issue remains resolved.

This incident has been resolved.

Salesforce is currently experiencing a service disruption impacting multiple regions. This may result in delays, intermittent errors, failed submissions, or difficulty accessing Salesforce-connected services. Salesforce has deployed a fix and services are recovering region by region. We are actively monitoring the recovery and assessing any impact to Intellistack customers. We will provide additional updates as more information becomes available.

A fix has been implemented and we are monitoring the results.

Salesforce has resolved the service disruption, and affected services have returned to normal operation. We have reviewed the impact of the outage across our Salesforce-connected products. Recovery requirements vary by product: Forms: Customers with failed Salesforce integrations will have received a failed integration notification. Affected submissions can be selected and the integration re-run from within Forms. Forms for Salesforce Classic: We will broadly resubmit failed submissions impacted by the outage. No customer action is required at this time. Forms for Salesforce Native: Because affected Salesforce orgs were unavailable, forms could not be served during the disruption. There are no submissions to recover; any forms that were not completed will need to be submitted again. Documents for Salesforce: Merge requests could not be initiated while affected Salesforce orgs were unavailable. Any required merges will need to be triggered again. Formstack Documents — Salesforce Deliveries: Depending on the configuration, failed merges or deliveries may need to be re-triggered. Please contact Support if assistance is needed. All services are currently operational. If you continue to experience issues related to this disruption, please contact our Support team.

We've identified an issue affecting confirmation emails sent through Formstack Forms. The Confirmation emails from forms are currently delayed or not being delivered, including test emails sent from the settings screen. Notification emails remain unaffected.

A fix has been implemented and we are monitoring results

The incident has been resolved

We are currently investigating an issue where some customers may receive unexpected account deactivation notifications related to bounced confirmation emails. Our team is actively working to identify the cause. We will provide additional updates as more information becomes available.

The issue affecting confirmation email delivery to Microsoft-hosted email addresses has been resolved. Confirmation emails should now be delivered as expected moving forward. We will continue to monitor for any additional issues.

This issue has been resolved. Confirmation emails to Microsoft-hosted email addresses are now being delivered as expected.

We are currently experiencing an outage affecting Formstack Forms that started at 4:03pm EST. The application is unavailable and returning 504 errors. Form submissions through the web interface are also unavailable. API submissions are still working. Our team is actively investigating the issue and working to restore service. We will provide updates as more information becomes available.

As of 4:26pm EST Formstack Forms is available, and form submissions through the web interface are now processing as expected. Our team is continuing to monitor the service to ensure stability.

This incident has been resolved. Formstack Forms is available and operating as expected. From 4:03 PM to 4:26 PM EST, the Formstack Forms application was unavailable and returned 504 errors. During this time, form submissions through the web interface were also unavailable. API submissions remained operational throughout the incident. Our team monitored the service following recovery and has confirmed that functionality has been restored.

Microsoft is currently experiencing an Exchange Online service issue that may impact customers using Microsoft 365 to send email through Formstack. Customers using Microsoft 365 to send merged documents through Formstack may experience merge errors and failed email deliveries. Customers may also encounter an error when attempting to authenticate or re-authenticate their Microsoft 365 email connection. No other Documents delivery services are impacted. Microsoft is working to restore service. We will provide additional updates as they become available.

Microsoft has completed its investigation and confirmed that Exchange Online remained healthy throughout the event. The issue has been identified as a DNS-related problem affecting Proofpoint, a third-party email service used to route external email traffic. Proofpoint has identified the root cause and is currently working to recover affected services. Formstack Documents customers whose Microsoft 365 email traffic is routed through Proofpoint may experience failed email deliveries or DNS-related errors when sending merged documents to external recipients. We are continuing to monitor the situation and will provide additional updates as they become available. Customers can also follow the latest updates on the Proofpoint Current Incidents status page at https://proofpoint.my.site.com/community/s/proofpoint-current-incidents.

This incident has been resolved. Our team identified and corrected a configuration issue affecting Microsoft 365 email delivery through Formstack Documents. Customers should now be able to send merged documents as expected. We apologize for the disruption and appreciate your patience.

We have identified an issue impacting the migration of large forms. While our team investigates, please refrain from migrating large forms to avoid potential issues or failed migrations. We are actively working to identify the root cause and will provide updates as more information becomes available. Thank you for your patience and understanding.

We have identified an issue affecting form migrations for a limited number of customers with very large forms. These migrations may fail or experience unexpected issues. While our team works toward a resolution, please refrain from migrating very large forms. We do not expect to have a substantive update before Monday, July 20. We will share additional information as it becomes available. Thank you for your patience and understanding.

We are continuing to work on a fix for this issue.

Resolved (Sandbox): The fix for the large form migration issue has been deployed to Sandbox. Customers who were impacted in Sandbox should republish their affected forms to restore expected functionality. We are currently working to deploy the fix to Production. We will provide another update once the Production fix has been released.

We are currently investigating reports of users receiving errors when accessing Formstack Documents through the OnlyOffice builder experience. At this time, we are seeing impact specifically related to the OnlyOffice builder. Native builder functionality, Manage Files access, and PDF uploads are currently operating as expected. Our team is actively working to identify the root cause and assess the full scope of impact. Additional updates will be provided as more information becomes available.

The issue has been identified and a fix is being implemented.

This incident has been resolved.

We are investigating reports that some users are unable to save changes to existing forms, publish form updates, or duplicate forms within Formstack Forms for Salesforce. Our team is actively reviewing the issue and gathering information to determine the scope and root cause. Based on our initial investigation, the issue appears to be related to Salesforce Summer '26; however, we are continuing to validate this finding and work toward a resolution. We will provide additional updates as our investigation progresses. Thank you for your patience while we work to resolve this issue.

The issue has been identified and a fix is being implemented.

We have identified and resolved the issue affecting form save, publish, and duplicate functionality within Formstack Forms for Salesforce. A fix has been released in version 4.155, and we are actively deploying this update to affected organizations. If you would prefer to install the update immediately, you can do so using the following package installation link: https://login.salesforce.com/packaging/installPackage.apexp?p0=04tg7000000BJDt We will continue monitoring the environment to ensure stability following the deployment. Thank you for your patience while we worked to resolve this issue.

We are currently investigating an issue where the Integration Settings page is not loading for some users. Our team has identified the underlying cause and is actively working on implementing a fix.

A fix has been implemented and we are monitoring the results.

This incident has been resolved.

We are currently investigating reports of users are unable to create, upload, replace, or save documents. Our team has confirmed the issue and is actively working to identify the root cause. We will provide updates as more information becomes available. At this time, document generation and merge functionality continue to operate normally and are not impacted by this issue.Thank you for your patience while we work to resolve this.

We have identified the cause of the issue affecting document creation, uploads, replacements, and saving. A fix has been developed and is currently being prepared for deployment. We expect the fix to be implemented within the next hour. Document generation and merge functionality continue to operate normally and are not impacted by this issue. We will provide another update once the fix has been deployed or if our timeline changes.

A fix has been implemented and we are monitoring the results.

This incident has been resolved.

We are investigating an issue affecting some in progress workflow sessions that include the Data Search step. Our engineering team is actively working on a fix. New updates will be shared as we learn more.

We have implemented a fix and are continuing to monitor workflow session performance to ensure stability.

We are continuing to monitor for any further issues.

This incident has been resolved. We implemented a fix and affected workflow sessions successfully resumed processing.