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Untriaged
Permalink CVE-2026-26233
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): NONE
  • Availability impact (A): LOW
created 2 weeks, 6 days ago
Denial of Service via HTTP/2 single packet attack on login endpoint

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 rate limit login requests which allows unauthenticated remote attackers to cause denial of service (server crash and restart) via HTTP/2 single packet attack with 100+ parallel login requests.. Mattermost Advisory ID: MMSA-2025-00566

References

Affected products

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

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