Medium severity · published Nov 14, 2025
CVE-2025-41436
Unauthorized access to archived channel content via threads interface
4.3
CVSS
0.2%
EPSS
No
On KEV
Description
Mattermost versions <11.0 fail to properly enforce the "Allow users to view archived channels" setting which allows regular users to access archived channel content and files via the "Open in Channel" functionality from followed threads
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 8% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
Mattermost · Mattermost
<11.0 through <11.0 · source: vendor
MS
Mattermost Server · Mattermost
before 11.0.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-41436
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-41436
Vendor Advisory
https://mattermost.com/security-updates
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