CVE-2026-1629: Permalink Preview Information Disclosure After Permission Revocation

Published Mar 16, 2026
·
Updated

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

Affected Software

2 affected components
mattermost<=10.11.10
Mattermost Mattermost Server>=10.11.0<10.11.11

Remediation

Information

Update Mattermost to versions 11.4.0, 10.11.11 or higher.

Event History

Mar 16, 2026
CVE Published
via MITRE·08:24 PM
Data Sourced
via MITRE·08:24 PM
RemedyDescriptionSeverityWeakness
Data Sourced
via NVD·09:16 PM
DescriptionSeverityWeaknessAffected Software
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Frequently Asked Questions

1

What is the severity of CVE-2026-1629?

CVE-2026-1629 is considered a medium severity vulnerability due to information disclosure risks.

2

How do I fix CVE-2026-1629?

To fix CVE-2026-1629, upgrade Mattermost to version 10.11.11 or later.

3

What types of information are disclosed in CVE-2026-1629?

CVE-2026-1629 discloses private channel content through cached permalink previews after permissions are revoked.

4

Which versions of Mattermost are affected by CVE-2026-1629?

Mattermost versions 10.11.x up to and including 10.11.10 are affected by CVE-2026-1629.

5

Is it safe to use Mattermost versions earlier than 10.11.11 after CVE-2026-1629?

No, using Mattermost versions earlier than 10.11.11 after the disclosure of CVE-2026-1629 poses a risk of sensitive information exposure.

Company

Resources

Contact

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