Access Control Flaw in Mattermost Confluence Plugin Affects User Channel Subscriptions
CVE-2025-8285

4MEDIUM

Key Information:

Vendor

Mattermost
Status
Mattermost Confluence Plugin
Vendor
CVE Published:
11 August 2025

What is CVE-2025-8285?

A security flaw in the Mattermost Confluence Plugin prior to version 1.5.0 permits unauthorized users to create channel subscriptions via API calls, bypassing necessary access controls. This vulnerability arises due to a failure to validate user permissions accurately when interacting with the channel subscription endpoint, potentially compromising the integrity of user access within the system.

Affected Version(s)

Mattermost Confluence Plugin 0 < 1.5.0

Mattermost Confluence Plugin 1.5.0

References

https://mattermost.com/security-updates

CVSS V3.1

Score:
4
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Lorenzo Gallegos
.
CVE-2025-8285 : Access Control Flaw in Mattermost Confluence Plugin Affects User Channel Subscriptions