What’s Vulnerable › Vulnerabilities

CVE-2025-52931: Unexpected input to Update Channel Subscription endpoint causes DoS in Mattermost Confluence Plugin

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% 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-754

Description

Mattermost Confluence Plugin version <1.5.0 fails to handle unexpected request body which allows attackers to crash the plugin via constant hit to update channel subscription endpoint with an invalid request body.

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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