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Permalink CVE-2026-2457
4.3 MEDIUM
  • CVSS version: 3.1
  • Attack vector (AV): NETWORK
  • Attack complexity (AC): LOW
  • Privileges required (PR): LOW
  • User interaction (UI): NONE
  • Scope (S): UNCHANGED
  • Confidentiality impact (C): NONE
  • Integrity impact (I): LOW
  • Availability impact (A): NONE
created 1 month ago
WebSocket Message Spoofing via Permalink Embed Manipulation

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to sanitize client-supplied post metadata which allows an authenticated attacker to spoof permalink embeds impersonating other users via crafted PUT requests to the post update API endpoint.. Mattermost Advisory ID: MMSA-2025-00569

References

Affected products

Mattermost
  • ==11.2.3
  • ==10.11.11
  • =<11.3.0
  • ==11.3.1
  • =<10.11.10
  • ==11.4.0
  • =<11.2.2

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

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