CVE-2026-115931: Postiz lets a signed-in user ask the backend to run a function on one of their connected channels

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CRITICAL 9.9

CVE-2026-115931 is a critical-severity flaw (CVSS 9.9) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Postiz lets a signed-in user ask the backend to run a function on one of their connected channels. The backend did not restrict which functions can be requested, so a user could call internal helper functions that were never meant to be reachable from the web interface. One of those helpers reads a file from the server's disk. A user who connects a channel whose stored token is a file path can have the backend return the contents of any file it

Why this priority

Critical severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.9 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	n/a
CISA exploited list	No
Weakness	CWE-73, CWE-470
Published	2026-10-23
Last modified	2026-10-23

Publisher (CNA): postiz

Timeline

2026-10-23 23:17 UTCPublished CVE record published
2026-10-23 23:17 UTCUpdated Record last modified

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Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

References

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