What’s Vulnerable › Vulnerabilities

CVE-2025-8285: Unauthorized Channel Subscription Creation in Mattermost Confluence Plugin

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-08-11 · updated 2026-06-17
• Weakness: CWE-862

Description

Mattermost Confluence Plugin version <1.5.0 fails to check the access of the user to the channel which allows attackers to create channel subscription without proper access to the channel via API call to the create channel subscription endpoint.

Affected products

• Mattermost Confluence Plugin: before 1.5.0 — fixed in 1.5.0

How to fix

Upgrade to a fixed version: Mattermost Confluence Plugin 1.5.0. Check the vendor advisory for mitigations.

References

• https://mattermost.com/security-updates

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