Provider incident title: “Errors in Custom Actions and Zapier MCP requests due to duplicated query parameters”
Started
Monday, October 12, 2026
08:39 AM UTC
Duration
1h 51m
total
Resolved
10:30 AM UTC
Oct 12, 2026
Status: 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. Affected components MCP (Degraded performance)
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This incident was sourced from Zapier's official status RSS feed. Tickerr polls RSS feeds every 10 minutes and merges updates from the same outage into a single incident timeline.
This incident lasted 1h 51m.
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