Description
Postiz is an AI social media scheduling tool. Versions prior to 2.21.8 contained an unauthenticated endpoint that accepted a signed token and applied subscription-enforcement side effects to the organization referenced in that token's claims, without verifying the token's intended purpose. The endpoint, /public/modify-subscription, could not change the persisted subscription tier, but it did execute enforcement-related side effects on the caller's own organization, including adjusting team-member enablement state, disabling integrations exceeding the asserted plan's limits, and resetting the scheduled-post cron when the asserted plan was the free tier. Impact is limited to the attacker's own organization and cannot be redirected at other tenants through this endpoint. This issue has been fixed in version 2.21.8.
Problem types
CWE-345: Insufficient Verification of Data Authenticity
CWE-639: Authorization Bypass Through User-Controlled Key
CWE-749: Exposed Dangerous Method or Function
CWE-862: Missing Authorization
Product status
References
github.com/...iz-app/security/advisories/GHSA-v4wr-4j8g-4hfj
github.com/...ommit/23696d2973510ae1f3f48bfa41a6bfbbf9827b05
gadvisory.org/advisories/PSA-2026-WWFR8X
github.com/gitroomhq/postiz-app/releases/tag/v2.21.8