CVE-2023-1775Unsanitized events sent over Websocket to regular users in a High Availability environment
- 4.3MediumCVSS base score
- 0.55%Exploitation in 30 daysEPSS · top 54% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
When running in a High Availability configuration, Mattermost fails to sanitize some of the user_updated and post_deleted events broadcast to all users, leading to disclosure of sensitive information to some of the users with currently connected Websocket clients.
Timeline
ID reserved
By Mattermost
Published
- 21 months later
· 21 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 | Medium6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 0.55% · top 54% of all CVEs (14 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 3.3.0 – ≤ 7.7.1
- affected 3.3.0 – ≤ 7.1.5
- affected 3.3.0 – < 7.8.0
- unaffected 7.8.0
- unaffected 7.7.2
- unaffected 7.1.6
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Gogithub.com/mattermost/mattermost-serverGHSA-8jhh-3jf2-pfwr (opens in a new tab)
- Gogithub.com/mattermost/mattermost-server/v5GHSA-8jhh-3jf2-pfwr (opens in a new tab)
- Gogithub.com/mattermost/mattermost-server/v6GHSA-8jhh-3jf2-pfwr (opens in a new tab)
What to do
Solution: Update Mattermost to version v7.8.0, v7.1.6, v7.7.2, 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-2023-0949 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-8jhh-3jf2-pfwr (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-2023-1775)Record last updated .