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CVE PROGRAM SOURCE RECORD4.3 Medium

CVE-2026-20719

DoS via URL Previews Rendering Malicious SVGs

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Status
Published
Published
Updated
Assigning organization
Mattermost

Description

Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to prevent rendering of external SVGs on link embeds which allows unauthenticated users to crash the Mattermost webapp and desktop app via creating an issue or PR on GitHub.. Mattermost Advisory ID: MMSA-2026-00595

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

  • 11.4.0 to ≤ 11.4.0affected
  • 11.3.0 to ≤ 11.3.1affected
  • 11.2.0 to ≤ 11.2.3affected
  • 10.11.0 to ≤ 10.11.11affected
  • 11.5.0unaffected
  • 11.4.1unaffected
  • 11.3.2unaffected
  • 11.2.4unaffected
  • 10.11.12unaffected

References