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CVE-2025-55074Channel member objects leak read status
- 3.0LowCVSS base score
- 0.18%Exploitation in 30 daysEPSS · top 92% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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
Timeline
ID reserved
By Mattermost
- 34 days later
· 34 days later
Published
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| MattermostCNA (assigner) | 3.1 | Low3.0 | CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:N/A:N |
| NVDNVD · Analyzed | 3.1 | Low3.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N |
- EPSS (exploitation in 30 days)
- 0.18% · top 92% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Low 3.0.
Affected products
- affected 10.11.0 – ≤ 10.11.3
- affected 10.5.0 – ≤ 10.5.11
- unaffected 11.0.0
- unaffected 10.11.4
- unaffected 10.5.12
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Gogithub.com/mattermost/mattermost-serverGHSA-9hh7-6558-qfp2 (opens in a new tab)
- Gogithub.com/mattermost/mattermost/server/v8GHSA-9hh7-6558-qfp2 (opens in a new tab)
What to do
Solution: Update Mattermost to versions 11.0.0, 10.11.4, 10.5.12 or higher.
References
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-198045 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-9hh7-6558-qfp2 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-55074)Record last updated .