CVE-2025-13821 json
User profile update exposes password hash and MFA secrets
published 2026-02-16 8 mo ago modified 2026-06-17 4 mo ago also GHSA-pp9j-pf5c-659x , GO-2026-4524 , EUVD-2025-206981
- cvss
- 5.7
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 14%
- public exploits
- 0
- none known
Summary
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
Patch / fix
- go github.com/mattermost/mattermost/server/v8 8.0.0-20251210191531-cd17b61de41b
- go github.com/mattermost/mattermost-server 5.3.2-0.20251210191531-cd17b61de41b
- Mattermost Mattermost 10.11.10, 11.1.3, 11.2.2, 11.3.0
- govulncheck-vulndb openSUSE Leap 15.6 0.0.20260226T182644-150000.1.149.1
suse advisories SUSE-SU-2026:0757-1
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 8 mo ago
Exploit prediction
0.24% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N |
| GitHub | 3.1 | 5.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost/server/v8 | <8.0.0-20251210191531-cd17b61de41b |
8.0.0-20251210191531-cd17b61de41b |
| go | github.com/mattermost/mattermost-server | >=11.1.0 >=10.11.0 >=11.2.0 <5.3.2-0.20251210191531-cd17b61de41b all versions >=10.11.0+incompatible >=11.1.0+incompatible >=11.2.0+incompatible |
5.3.2-0.20251210191531-cd17b61de41b |
| go | github.com/mattermost/mattermost-server/v5 | all versions |
no fix listed |
| go | github.com/mattermost/mattermost-server/v6 | all versions |
no fix listed |
Affected products
- Mattermost Mattermost
Classification
- Weakness
-
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
References
Sources
- CVE List CVE-2025-13821
- GitHub Advisory GHSA-pp9j-pf5c-659x
- NVD CVE-2025-13821
- OSV GO-2026-4524
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.