Mattermost Mobile Apps Vulnerability Allows Unauthorized Access to User Sessions
CVE-2025-59480

6.1MEDIUM

Key Information:

Vendor

Mattermost
Status
Mattermost
Vendor
CVE Published:
13 November 2025

What is CVE-2025-59480?

Versions of Mattermost Mobile Apps up to and including 2.32.0 contain a vulnerability where the system fails to properly verify that Single Sign-On (SSO) redirect tokens are coming from a trusted server. This oversight allows malicious instances of Mattermost or an on-path attacker to exploit the vulnerability and potentially gain access to user session credentials through crafted URL responses. Users of these versions should take immediate action to secure their systems.

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Affected Version(s)

Mattermost 0 <= 2.32.0

Mattermost 2.33.0

References

https://mattermost.com/security-updates

CVSS V3.1

Score:
6.1
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Doyensec
JSON
.