CVE-2023-5967
Denial of Service via crashing the Calls Plugin
- Published
- Updated
- Reserved
- Assigned by
- Mattermost
Description
Mattermost fails to properly validate requests to the Calls plugin, allowing an attacker sending a request without a User Agent header to cause a panic and crash the Calls plugin
Timeline
ID reserved
By Mattermost
Published
- 10 months later
· 10 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:N/I:N/A:L |
| NVDNVD · Modified | 3.1 | Medium4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
- EPSS (exploitation in 30 days)
- 0.61% · top 50% of all CVEs (7 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.
Weakness
Affected products
- affected ≤ 8.1.2
- affected ≤ 8.0.3
- affected ≤ 7.8.11
- unaffected 8.1.3
- unaffected 8.0.4
- unaffected 7.8.12
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Gogithub.com/mattermost/mattermost-server/v6GHSA-xvq6-h898-wcj8 (opens in a new tab)
- Gogithub.com/mattermost/mattermost/server/v8GHSA-xvq6-h898-wcj8 (opens in a new tab)
What to do
Solution: Update Mattermost Server to versions 7.8.12, 8.0.4, 8.1.3 or higher. Alternatively, upgrade the Calls plugin to 0.17.1 or higher.
References (1)
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)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-xvq6-h898-wcj8 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2023-5967)Record last updated .