What’s Vulnerable › Vulnerabilities

CVE-2025-54478: Unauthenticated Channel Subscription Edit 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-306

Description

Mattermost Confluence Plugin version <1.5.0 fails to enforce authentication of the user to the Mattermost instance which allows unauthenticated attackers to edit channel subscriptions via API call to the edit 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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