SARA / Free Tools / CVE / CVE-2023-3581

CVE-2023-3581 — Mattermost fails to properly validate the origin of a websocket connection allow

Mattermost fails to properly validate the origin of a websocket connection allowing a MITM attacker on Mattermost to access the websocket APIs.

CVSS

6.2 MEDIUM

EPSS

14.00% (top 66.20%)

CWE

CWE-346

Published

2023-07-17T15:20:00.186Z

Last modified

2024-10-30T13:54:50.335Z

CVSS vector

CVSS:3.1/AV:P/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

01What is this vulnerability?

Mattermost fails to properly validate the origin of a websocket connection allowing a MITM attacker on Mattermost to access the websocket APIs.

Vendor	Product	Versions
Mattermost	Mattermost	0, 0, 0, 7.8.7, 7.9.5, 7.10.3

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

Patch to a fixed version listed in the vendor advisory (see references below).
Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
Hunt historical logs for exploitation indicators — see Detection signatures below.

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

Want this in your SOAR or SIEM?
SARA's API returns EPSS, CVSS, KEV, and an analyst-grade summary in one call.