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CVE PROGRAM SOURCE RECORD3.5 Low

CVE-2026-3472

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

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Status
Published
Published
Updated
Assigning organization
Mattermost

Description

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 products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Mattermost Mattermost

Default version status: unaffected

  • 10.11.0 to ≤ 10.11.18affected
  • 11.6.0 to ≤ 11.6.3affected
  • 11.5.0 to ≤ 11.5.6affected
  • 11.7.0unaffected
  • 10.11.19unaffected
  • 11.6.4unaffected
  • 11.5.7unaffected

References