PT-2026-25812 · Mattermost · Mattermost

Joshua Rogers · Published 2026-02-13 · Updated 2026-03-17 · CVE-2026-1629

Positive Technologies (AI Summary)

CVSS v3.1

4.3

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Mattermost versions 10.11.0 through 10.11.10

Description Mattermost fails to invalidate cached permalink preview data when a user loses channel access. This allows a user to continue viewing private channel content through previously cached permalink previews until the cache is reset or the user logs in again. The issue is identified by Mattermost Advisory ID MMSA-2026-00580.

Recommendations Mattermost versions 10.11.0 through 10.11.10 should be updated to a version where this issue is resolved.

Fix

Improper Access Control

Weakness Enumeration

CWE-672

CWE-284

Related Identifiers

BDU:2026-06563

CVE-2026-1629

Affected Products

Mattermost

References · 6

• https://mattermost.com/security-updates · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-06563 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-1629 · Security Note
• https://osv.dev/vulnerability/CVE-2026-1629 · Vendor Advisory
• https://twitter.com/CVEnew/status/2033755317763223688 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2033753588472729704 · Twitter Post