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VulnerabilityPublished

CVE-2025-41436: Mattermost · Incorrect Authorization

Affects MattermostSource GCVE Database

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Not known to be exploited · CVSS 3.1 Low : upgrade to 11.0 when convenient.

Data as of 13 Nov 2026, 18:45 UTC

CVSS 3.1 base score
3.1Low
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (Mattermost)CVSS 3.13.1
Patch
Available – fixed in 11.0
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 14 Nov 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.

What to do

Upgrade Mattermost to 11.0.

Affected software

ProductAffectedFixed in
Mattermost MattermostAffected
  • <11.0
Fixed in
  • 11.0

AI-suggested

Upgrade Mattermost to version 11.0 or later where this authorization issue is fixed. No other mitigation is required as the vendor has provided an official fix.

Description

CVE-2025-41436 is an authorization vulnerability in Mattermost versions prior to 11.0. The flaw allows regular users to access content and files in archived channels despite the "Allow users to view archived channels" setting being disabled. This occurs via the "Open in Channel" feature from followed threads. The issue is fixed in Mattermost version 11.0.

References

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