CVE-2026-10106

Unauthorized users can trigger interactive post actions in private channels via action cookie channel mismatch in Mattermost

State: Published
Severity: 6.5 Medium
Published: Jul 13, 2026
Updated: Jul 13, 2026
Reserved: May 29, 2026

Read the record on cve.org

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

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N	Mattermost

Weaknesses

CWE-863 Incorrect Authorization

Affected Products

Product	Versions
MattermostMattermost	11.7.0 through 11.7.2Affected 11.6.0 through 11.6.4Affected 10.11.0 through 10.11.19Affected 11.8.0Not affected 11.7.3Not affected 11.6.5Not affected 10.11.20Not affected

References

MMSA-2026-00690vendor-advisory

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.