← CVE Intelligence

CVE-2026-3472

Markdown image rendering bypass in AI bot tool result posts in Mattermost PUBLISHED

Description (CNA)

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-controlled server via injecting markdown image syntax into tool result content rendered by a victim's client.. Mattermost Advisory ID: MMSA-2026-00619

Affected (CNA)

Vendor / productVersions
Mattermost / Mattermostaffected 10.11.0 through 10.11.18; affected 11.6.0 through 11.6.3; affected 11.5.0 through 11.5.6; unaffected 11.7.0; unaffected 10.11.19; unaffected 11.6.4; unaffected 11.5.7

CWE

CWE-693

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.