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Description

Mattermost Plugins versions <=11.4 11.0.4 11.1.3 11.3.2 10.11.11.0 fail to validate incoming request size which allows an authenticated attacker to cause service disruption via the webhook endpoint. Mattermost Advisory ID: MMSA-2026-00589

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




MEDIUM: 4.9CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Problem types

CWE-400 Uncontrolled Resource Consumption

Product status

Default status
unaffected

Any version
affected

Any version
affected

Any version
affected

Any version
affected

11.5.0
unaffected

11.4.1
unaffected

11.3.2
unaffected

11.2.4
unaffected

10.11.12
unaffected

Credits

thecybertantrik finder

References

mattermost.com/security-updates (MMSA-2026-00589) vendor-advisory

cve.org (CVE-2026-3116)

nvd.nist.gov (CVE-2026-3116)

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