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Permalink CVE-2026-22880
6.1 MEDIUM
  • CVSS version (CVSS): 3.1
  • Attack Vector (AV): Network (N)
  • Attack Complexity (AC): High (H)
  • Privileges Required (PR): None (N)
  • User Interaction (UI): Required (R)
  • Scope (S): Changed (C)
  • Confidentiality (C): High (H)
  • Integrity (I): None (N)
  • Availability (A): None (N)
  • Modified Attack Vector (MAV): Network (N)
  • Modified Attack Complexity (MAC): High (H)
  • Modified Privileges Required (MPR): None (N)
  • Modified User Interaction (MUI): Required (R)
  • Modified Confidentiality (MC): High (H)
  • Modified Scope (MS): Changed (C)
  • Modified Integrity (MI): None (N)
  • Modified Availability (MA): None (N)
created 3 days, 7 hours ago Activity log
  • Created suggestion 3 days, 7 hours ago
Mobile SSO authentication flow allows credential theft via malicious server

Mattermost Mobile Apps versions <=2.37 11.4 2.0.37 11.0.4 11.1.3 11.3.2 10.11.11.0 fail to properly validate the SSO authentication callback origin which allows an attacker controlling a malicious Mattermost server to steal user credentials for a legitimate Mattermost server via relaying the SSO code exchange flow through the mobile application. Mattermost Advisory ID: MMSA-2025-00564

References

Affected products

Mattermost
  • ==2.37.1.0
  • ==10.11.12
  • =<2.0.37
  • ==11.5.0
  • ==11.4.1
  • =<11.3.2
  • =<10.11.11
  • =<11.1.3
  • ==11.3.2
  • ==2.38.0
  • ==11.2.4
  • =<11.0.4

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