CVE-2025-27538 json
MFA Enforcement Bypass Allows Unauthorized Removal of MFA for Other Users
published 2025-04-16 18 mo ago modified 2026-09-10 1 mo ago also GHSA-j5jw-m2ph-3jjf , GO-2025-3620 , EUVD-2025-11361
- cvss
- 2.2
- 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 15%
- public exploits
- 0
- none known
Summary
Mattermost versions 10.5.x <= 10.5.1, 9.11.x <= 9.11.9 fail to enforce MFA checks in PUT /api/v4/users/user-id/mfa when the requesting user differs from the target user ID, which allows users with edit_other_users permission to activate or deactivate MFA for other users, even if those users have not set up MFA.
Patch / fix
- go github.com/mattermost/mattermost/server/v8 8.0.0-20250314142426-c049748b8863, 9.11.10, 10.5.2
- go github.com/mattermost/mattermost-server 9.11.10+incompatible, 10.5.2+incompatible
- Mattermost Mattermost 9.11.10, 10.5.2, 10.6.0
- govulncheck-vulndb openSUSE Tumbleweed 0.0.20250422T181640-1.1
opensuse advisories openSUSE-SU-2025:15017-1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 18 mo ago
Exploit prediction
0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 2.2 | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N |
| NVD | 3.1 | 2.7 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N |
| GitHub | 3.1 | 2.2 | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost/server/v8 | >=10.5.0, <10.5.2 >=9.11.0, <9.11.10 <8.0.0-20250314142426-c049748b8863 |
10.5.2 9.11.10 8.0.0-20250314142426-c049748b8863 |
| go | github.com/mattermost/mattermost-server | >=9.11.0+incompatible, <9.11.10+incompatible >=10.5.0+incompatible, <10.5.2+incompatible |
9.11.10+incompatible 10.5.2+incompatible |
| 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-306 Missing Authentication for Critical Functionality
References
-
mattermost.com
/security-updates
web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2025-27538
advisory
-
github.com
/mattermost/mattermost
package
-
pkg.go.dev
/vuln/GO-2025-3620
web
-
github.com
/advisories/GHSA-j5jw-m2ph-3jjf
advisory
Sources
- CVE List CVE-2025-27538
- GitHub Advisory GHSA-j5jw-m2ph-3jjf
- NVD CVE-2025-27538
- OSV GO-2025-3620
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