CVE-2026-3472 — Markdown image rendering bypass in AI bot tool result posts in Mattermost
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 allow…
Published: 2026-06-26 · CVSS: 3.5 · CVSS 3.1
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
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7