CVE-2026-1629

MEDIUM

Permalink Preview Information Disclosure After Permission Revocation

Title source: cna

Description

Mattermost versions 10.11.x <= 10.11.10 Fail to invalidate cached permalink preview data when a user loses channel access which allows the user to continue viewing private channel content via previously cached permalink previews until cache reset or relogin.. Mattermost Advisory ID: MMSA-2026-00580

References (1)

[Vendor Advisory] https://mattermost.com/security-updates

Scores

CVSS v3 4.3

EPSS 0.0007

EPSS Percentile 20.8%

Attack Vector NETWORK

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

Details

CWE

CWE-672

Status published

Products (4)

Mattermost/Mattermost 10.11.0 - 10.11.10

Mattermost/Mattermost 10.11.11

Mattermost/Mattermost 11.4.0

mattermost/mattermost_server 10.11.0 - 10.11.11

Published Mar 16, 2026

Tracked Since Mar 17, 2026