Medium severity · published Feb 16, 2026
CVE-2025-13821
User profile update exposes password hash and MFA secrets
5.7
CVSS
0.2%
EPSS
No
On KEV
Description
Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to sanitize sensitive data in WebSocket messages which allows authenticated users to exfiltrate password hashes and MFA secrets via profile nickname updates or email verification events. Mattermost Advisory ID: MMSA-2025-00560
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 15% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
Mattermost · Mattermost
11.1.0 through 11.1.2; 10.11.0 through 10.11.9; 11.2.0 through 11.2.1 · source: vendor
MS
Mattermost Server · Mattermost
10.11.0 before 10.11.10; 11.1.0 before 11.1.3; 11.2.0 before 11.2.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-13821
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-13821
Vendor Advisory
https://mattermost.com/security-updates
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