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Untriaged
Permalink CVE-2026-20719
4.3 MEDIUM
  • CVSS version (CVSS): 3.1
  • Attack Vector (AV): Network (N)
  • Attack Complexity (AC): Low (L)
  • Privileges Required (PR): Low (L)
  • User Interaction (UI): None (N)
  • Scope (S): Unchanged (U)
  • Confidentiality (C): None (N)
  • Integrity (I): None (N)
  • Availability (A): Low (L)
  • Modified Attack Vector (MAV): Network (N)
  • Modified Attack Complexity (MAC): Low (L)
  • Modified Privileges Required (MPR): Low (L)
  • Modified User Interaction (MUI): None (N)
  • Modified Confidentiality (MC): None (N)
  • Modified Scope (MS): Unchanged (U)
  • Modified Integrity (MI): None (N)
  • Modified Availability (MA): Low (L)
created 1 month, 4 weeks ago Activity log
  • Created suggestion 1 month, 4 weeks ago
DoS via URL Previews Rendering Malicious SVGs

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

References

Affected products

Mattermost
  • =<11.2.3
  • ==11.3.2
  • ==11.4.1
  • ==11.5.0
  • =<11.4.0
  • ==10.11.12
  • =<10.11.11
  • ==11.2.4
  • =<11.3.1

Matching in nixpkgs

pkgs.mattermostLatest

Mattermost is an open source platform for secure collaboration across the entire software development lifecycle

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