CVE-2026-3109 | THREATINT

Description

Mattermost Plugins versions <=11.4 10.11.11.0 fail to validate webhook request timestamps which allows an attacker to corrupt Zoom meeting state in Mattermost via replayed webhook requests. Mattermost Advisory ID: MMSA-2026-00584

PUBLISHED Reserved 2026-02-24 | Published 2026-03-26 | Updated 2026-03-26 | Assigner Mattermost

LOW: 2.2CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L

Problem types

CWE-754: Improper Check for Unusual or Exceptional Conditions

Product status

Default status

unaffected

Any version

affected

11.5.0

unaffected

10.11.12

unaffected

Credits

thecybertantrik finder

References

mattermost.com/security-updates (MMSA-2026-00584) vendor-advisory

cve.org (CVE-2026-3109)

nvd.nist.gov (CVE-2026-3109)

Download JSON