Team Joining Vulnerability in Mattermost by Mattermost Inc.
CVE-2025-58073

8.1HIGH

Key Information:

Vendor

Mattermost
Status
Mattermost
Vendor
CVE Published:
16 October 2025

What is CVE-2025-58073?

An authorization bypass vulnerability exists in Mattermost that allows unauthorized users to join any team on a Mattermost server by manipulating the OAuth state. The flaw arises from the application failing to properly verify whether a user has permission to use the original invite token. As a result, attackers can exploit this weakness, potentially gaining unfettered access to sensitive team communications and collaboration spaces.

Affected Version(s)

Mattermost 10.11.0 <= 10.11.1

Mattermost 10.10.0 <= 10.10.2

Mattermost 10.5.0 <= 10.5.10

References

https://mattermost.com/security-updates

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

DoyenSec
JSON
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CVE-2025-58073 : Team Joining Vulnerability in Mattermost by Mattermost Inc.