CVE-2023-6202Insecure Direct Object Reference in /plugins/focalboard/ api/v2/users of Mattermost Boards
- 4.3MediumCVSS base score
- 0.44%Exploitation in 30 daysEPSS · top 61% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
Mattermost fails to perform proper authorization in the /plugins/focalboard/api/v2/users endpoint allowing an attacker who is a guest user and knows the ID of another user to get their information (e.g. name, surname, nickname) via Mattermost Boards.
Timeline
ID reserved
By Mattermost
- 7 days later
· 7 days later
Published
- 11 months later
· 11 months later
Record updated
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 | Medium4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
| NVDNVD · Modified | 3.1 | Medium4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
- EPSS (exploitation in 30 days)
- 0.44% · top 61% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.3.
Affected products
- affected ≤ 7.8.12
- affected ≤ 8.1.3
- affected ≤ 9.0.1
- affected ≤ 9.1.0
- unaffected 9.0.2
- unaffected 9.1.1
- unaffected 7.8.13
- unaffected 8.1.4
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Gogithub.com/mattermost/mattermost-server/v6GHSA-85jj-c9jr-9jhx (opens in a new tab)
- Gogithub.com/mattermost/mattermost/server/v8GHSA-85jj-c9jr-9jhx (opens in a new tab)
What to do
Solution: Update Mattermost Server to versions 9.0.2, 9.1.1, 7.8.13, 8.1.4 or higher.
References
References1
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-2023-2916 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-85jj-c9jr-9jhx (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-2023-6202)Record last updated .