Vulnerability 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://gadvisory.org/advisories/PSA-2026-WWFR8X
- https://github.com/gitroomhq/postiz-app/commit/23696d2973510ae1f3f48bfa41a6bfbbf
- https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.8
- https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-v4wr-4j8g-4hfj
FAQ
What is CVE-2026-48783?
CVE-2026-48783 is a vulnerability with a CVSS score of 4.8 (MEDIUM). 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 organ...
How severe is CVE-2026-48783?
CVE-2026-48783 has been rated MEDIUM with a CVSS base score of 4.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-48783?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.