Outage in Zapier
Errors in Custom Actions and Zapier MCP requests due to duplicated query parameters
Resolved Minor
October 12, 2026 - Started 1 day ago
- Lasted about 2 hours
Incident Report
Summary AI Generated
Zapier experienced a ~1.9-hour incident where Custom Actions in Zaps and Zapier MCP requests were sending duplicated query parameters, causing errors for some users despite valid inputs. Standard app actions for connected apps were unaffected, and not all Custom Action requests failed. A fix deployed around 09:40 UTC immediately restored normal error rates, with no data loss identified.
We've identified an issue where some requests made through Custom Actions in Zaps or Zapier MCP include duplicated query parameters. Because of this, some customers may see errors even when their inputs are valid. Not every app or request is affected, since many apps handle duplicate query parameters without issue.
Standard app actions for connected apps that run in Zaps are not affected. We'll update this page as soon as we have more information.
If you need help, please reach out to our Support team at https://zapier.com/app/get-help.
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Latest Updates ( sorted recent to last )
MONITORING
1 day ago - at 10/12/2026 10:12AM
A fix has been deployed that stops Custom Actions and Zapier MCP requests from sending duplicated query parameters. Error rates on affected requests dropped to normal immediately after deployment (~09:40 UTC).
Not every request failed during the issue, and we have not identified evidence of data loss. If a connected app behaved unexpectedly during this window, please reach out so we can take a closer look.
We’re continuing to monitor and will post a final update within 24 hours.
If you need help, please reach out to our Support team at https://zapier.com/app/get-help.
IDENTIFIED
1 day ago - at 10/12/2026 08:39AM
We've identified an issue where some requests made through Custom Actions in Zaps or Zapier MCP include duplicated query parameters. Because of this, some customers may see errors even when their inputs are valid. Not every app or request is affected, since many apps handle duplicate query parameters without issue.
Standard app actions for connected apps that run in Zaps are not affected. We'll update this page as soon as we have more information.
If you need help, please reach out to our Support team at https://zapier.com/app/get-help.
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