CVE-2026-1629

MEDIUM

Permalink Preview Information Disclosure After Permission Revocation

Title source: cna
STIX 2.1

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)

Core 1
Core References
Vendor Advisory vendor-advisory
MMSA-2026-00580
https://mattermost.com/security-updates

Scores

CVSS v3 4.3
EPSS 0.0009
EPSS Percentile 25.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

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