CVE-2025-49221 Unauthenticated Access to Channel Subscription in Mattermost Confluence Plugin

What is CVE-2025-49221?

CVE-2025-49221 is a low-severity missing authorization vulnerability in Mattermost Confluence Plugin, published on 11 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Mattermost Confluence Plugin version <1.5.0 fails to enforce authentication of the user to the Mattermost instance which allows unauthenticated attackers to access subscription details without via API call to GET subscription endpoint.

Weakness: CWE-862

Which versions are affected by CVE-2025-49221?

3 open source packages ship an affected version, including github.com/mattermost/mattermost-plugin-confluence. It affects 1 product.

Products include Mattermost Confluence.

How do I fix CVE-2025-49221?

Upgrade github.com/mattermost/mattermost-plugin-confluence to 1.5.0 or later.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2025-49221 being exploited?

There is no known exploitation of CVE-2025-49221 in the wild and no public exploit code.

Other vulnerabilities in Mattermost Confluence Plugin

• CVE-2025-13523 Cross-Site Scripting (XSS) via Unescaped Display Names in Mattermost Confluence Plugin OAuth2 Flow High 7.7
• CVE-2025-52931 Unexpected input to Update Channel Subscription endpoint causes DoS in Mattermost Confluence Plugin High 7.5
• CVE-2025-54525 Unexpected input to Create Channel Subscription endpoint causes DoS in Mattermost Confluence Plugin High 7.5
• CVE-2025-44004 Unauthenticated Channel Subscription Creation in Mattermost Confluence Plugin High 7.2
• CVE-2025-54478 Unauthenticated Channel Subscription Edit in Mattermost Confluence Plugin High 7.2

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-rfg4-2m63-fw2q, GO-2025-3862.