What is CVE-2026-3472?

CVE-2026-3472 is a low-severity vulnerability in Mattermost, classified under Protection Mechanism Failure. CVSS score: 3.5/10. Published 2026-06-26.

How severe is CVE-2026-3472?

Low severity. CVSS v3 base score is 3.5 out of 10.

Vulnerability in Mattermost

CVE-2026-3472

Mattermost versions 10.11.x <= 10.11.18, 11.6.x <= 11.6.3, 11.5.x <= 11.5.6 fail to properly apply markdown image rendering restrictions to AI bot tool result posts, which allows an authenticated attacker to exfiltrate data to an attacker-…

CVSS v3 metric

CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N.

Affected products

Mattermost — versions 10.11.0, 11.6.0, 11.5.0

Weakness classification (CWE)

CWE-693 — Protection Mechanism Failure

References

responsibledisclosure@mattermost.com (vendor-advisory)

Frequently asked questions

What is CVE-2026-3472?: CVE-2026-3472 is a low-severity vulnerability in Mattermost, classified under Protection Mechanism Failure. CVSS score: 3.5/10. Published 2026-06-26.
How severe is CVE-2026-3472?: Low severity. CVSS v3 base score is 3.5 out of 10.