CVE-2026-1629

Medium

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

SeverityMedium

CVSS4.3

Exploit probability14. percentile0.2%

Product

Mattermost Server

PublishedMar 16, 2026

First seenMar 16, 2026

Weakness typeCWE-672CWE-672

How to fix

Update

mattermost mattermost_server10.11.11 or later

Vendor advisories

mattermost.com/security-updates

Affected products

Product	Affected versions	Fixed in
mattermost mattermost_server	10.11.0 ≤ v < 10.11.11	10.11.11

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