CVE-2025-55074 json
Channel member objects leak read status
published 2025-11-18 11 mo ago modified 2026-10-19 20 d ago also GHSA-9hh7-6558-qfp2 , GO-2025-4133 , EUVD-2025-198045
- cvss
- 3.0
- 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 7%
- public exploits
- 0
- none known
Summary
Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11 fail to enforce access permissions on the Agents plugin which allows other users to determine when users had read channels via channel member objects
Patch / fix
- go github.com/mattermost/mattermost-server 10.5.12, 10.5.12+incompatible, 10.11.4, 10.11.4+incompatible
- go github.com/mattermost/mattermost/server/v8 8.0.0-20250905150616-ba86dfc5876b6
- Mattermost Mattermost 10.5.12, 10.11.4, 11.0.0
- govulncheck-vulndb SLE Module for Package Hub 15 SP6, openSUSE Leap 15.6 0.0.20251209T172047-150000.1.127.1
suse advisories SUSE-SU-2025:4395-1
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
- github.com/mattermost/mattermost@98acefe commit
- github.com/mattermost/mattermost@ba86dfc commit
- github.com/mattermost/mattermost@d72d437 commit
- github.com/mattermost/mattermost#33835 pull request
- github.com/mattermost/mattermost#33905 pull request
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 11 mo ago
Exploit prediction
0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 3.0 | CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:N/A:N |
| NVD | 3.1 | 3.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N |
| GitHub | 3.1 | 3.0 | CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost-server | >=10.11.0, <10.11.4 >=10.5.0, <10.5.12 >=10.5.0+incompatible, <10.5.12+incompatible >=10.11.0+incompatible, <10.11.4+incompatible |
10.11.4 10.5.12 10.5.12+incompatible 10.11.4+incompatible |
| go | github.com/mattermost/mattermost/server/v8 | <8.0.0-20250905150616-ba86dfc5876b6 all versions |
8.0.0-20250905150616-ba86dfc5876b6 |
| 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
References
-
github.com
/mattermost/mattermost/pull/33835
web
-
github.com
/mattermost/mattermost/pull/33905
web
-
github.com
/mattermost/mattermost/commit/98acefe911dd9de7edf47a7d825dd99f53141a52
web
-
github.com
/mattermost/mattermost/commit/ba86dfc5876b354b9d3c20ff45c08ca6f8426149
web
-
github.com
/mattermost/mattermost/commit/d72d437f1567ba0b639b6e4fd73bab06c51baab5
web
-
mattermost.com
/security-updates
web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2025-55074
advisory
-
github.com
/advisories/GHSA-9hh7-6558-qfp2
advisory
-
github.com
/mattermost/mattermost
package
Sources
- CVE List CVE-2025-55074
- GitHub Advisory GHSA-9hh7-6558-qfp2
- NVD CVE-2025-55074
- OSV GO-2025-4133
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.