CVE-2025-13767 MEDIUM

CVE-2025-13767: Unauthorized Read Access to Private Channel Posts via Mattermost Jira Plugin

Vendor Mattermost

Product Mattermost

Weakness CWE-863 · Incorrect authorization

Published December 24, 2025

Last update December 24, 2025

View on NVD All CVEs

CVSS base score

4.3/10

Attack vector Network

Attack complexity Low

Privileges required Low

User interaction None

Confidentiality Low

Integrity None

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

December 24, 2025 CVE published

December 24, 2025 Record updated

External resources

03References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2025-13767 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/863.html

Identifiers

CVE CVE-2025-13767

CWE CWE-863

CVSS 4.3 / MEDIUM

Affected versions

Vendor Mattermost

Product Mattermost

Affected ≥ 11.1.0 and ≤ 11.1.0

Vendor Mattermost

Product Mattermost

Affected ≥ 11.0.0 and ≤ 11.0.5

Vendor Mattermost

Product Mattermost

Affected ≥ 10.12.0 and ≤ 10.12.3

Vendor Mattermost

Product Mattermost

Affected ≥ 10.11.0 and ≤ 10.11.7