CVE-2026-8074 json
Improper Permission Check Allows User Manager to Deactivate Bot Accounts
published 4mo ago modified last mo. also GHSA-g5vr-6pgg-74qv , GO-2026-6481 , EUVD-2026-38248
- cvss
- 3.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 25%
- public exploits
- 0
- none known
Summary
Mattermost versions 11.7.x <= 11.7.0, 10.11.x <= 10.11.17 fail to enforce bot-specific permission checks on the user active status endpoint, which allows a User Manager with user management write access but no Integrations access to deactivate bot accounts via the PUT /api/v4/users/{id}/active API endpoint.. Mattermost Advisory ID: MMSA-2026-00667
Patch / fix
- go github.com/mattermost/mattermost-server 10.11.18, 10.11.18+incompatible, 11.7.1, 11.7.1+incompatible
- Mattermost Mattermost 10.11.18, 11.7.1, 11.8.0
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Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 4mo ago
Exploit prediction
0.32% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 3.8 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L |
| GitHub | 3.1 | 3.8 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost-server | >=11.7.0, <11.7.1 >=10.11.0, <10.11.18 >=10.11.0+incompatible, <10.11.18+incompatible >=11.7.0+incompatible, <11.7.1+incompatible |
11.7.1 10.11.18 10.11.18+incompatible 11.7.1+incompatible |
Affected products
- Mattermost Mattermost
Classification
- Weakness
-
- CWE-863 Incorrect Authorization
References
-
mattermost.com
/security-updates
vendor-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-8074
advisory
-
github.com
/mattermost/mattermost
package
-
github.com
/advisories/GHSA-g5vr-6pgg-74qv
advisory
Sources
- CVE List CVE-2026-8074
- GitHub Advisory GHSA-g5vr-6pgg-74qv
- NVD CVE-2026-8074
- OSV GO-2026-6481
Fencer Intel 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.