CVE-2025-13767

Unauthorized Read Access to Private Channel Posts via Mattermost Jira Plugin

State: Published
Severity: 4.3 Medium
Published: Dec 24, 2025
Updated: Dec 24, 2025
Reserved: Nov 27, 2025

Description

Mattermost versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x <= 10.11.7 fails to validate user channel membership when attaching Mattermost posts as comments to Jira issues, which allows an authenticated attacker with access to the Jira plugin to read post content and attachments from channels they do not have access to.

Scores

CVSS	Score	Vector	Source
3.1	4.3 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N	Mattermost

Weaknesses

CWE-863 Incorrect Authorization

Affected Products

Product	Versions
MattermostMattermost	11.1.0 through 11.1.0Affected 11.0.0 through 11.0.5Affected 10.12.0 through 10.12.3Affected 10.11.0 through 10.11.7Affected 11.2.0Not affected 11.1.1Not affected 11.0.6Not affected 10.12.4Not affected 10.11.8Not affected

References

https://mattermost.com/security-updates

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