Home

Description

Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to verify that the channel referenced in an action cookie matches the channel of the target post, which allows an authenticated user without access to a private channel to trigger interactive post actions on posts in that channel via a cookie obtained from any accessible channel.. Mattermost Advisory ID: MMSA-2026-00690

PUBLISHED Reserved 2026-05-29 | Published 2026-07-13 | Updated 2026-07-13 | Assigner Mattermost




MEDIUM: 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Problem types

CWE-863: Incorrect Authorization

Product status

Default status
unaffected

11.7.0 (semver)
affected

11.6.0 (semver)
affected

10.11.0 (semver)
affected

11.8.0
unaffected

11.7.3
unaffected

11.6.5
unaffected

10.11.20
unaffected

Credits

minghseinyuc86595 finder

References

mattermost.com/security-updates (MMSA-2026-00690) vendor-advisory

cve.org (CVE-2026-10106)

nvd.nist.gov (CVE-2026-10106)

Download JSON