CVE-2026-1629
Received Received - Intake
Cached Permalink Exposure in Mattermost 10.11.x Allows Data Leakage

Publication date: 2026-03-16

Last updated on: 2026-03-18

Assigner: Mattermost, Inc.

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
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Published
2026-03-16
Last Modified
2026-03-18
Generated
2026-06-16
AI Q&A
2026-03-16
EPSS Evaluated
2026-06-14
NVD
CVE-2026-1629
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
mattermost mattermost_server From 10.11.0 (inc) to 10.11.11 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-672 The product uses, accesses, or otherwise operates on a resource after that resource has been expired, released, or revoked.
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Executive Summary

This vulnerability affects Mattermost versions 10.11.x up to and including 10.11.10. It occurs because the software fails to invalidate cached permalink preview data when a user loses access to a channel. As a result, the user can continue to view private channel content through previously cached permalink previews until the cache is reset or the user logs out and logs back in.

Detection Guidance

I don't know

Mitigation Strategies

I don't know

Impact Analysis

The impact of this vulnerability is that users who should no longer have access to certain private channel content may still be able to view that content via cached permalink previews. This could lead to unauthorized disclosure of private information until the cache is cleared or the user relogs.

Compliance Impact

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