CVE-2025-54458 Unauthorized Subscription Creation to Confluence Space in Mattermost Confluence Plugin

What is CVE-2025-54458?

CVE-2025-54458 is a medium-severity missing authorization vulnerability in Mattermost Confluence Plugin, published on 11 Aug 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Mattermost Confluence Plugin version <1.5.0 fails to check the access of the user to the Confluence space which allows attackers to create a subscription for a Confluence space the user does not have access to via the create subscription endpoint.

Weakness: CWE-862

Which versions are affected by CVE-2025-54458?

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-2025-54458?

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-2025-54458 being exploited?

There is no known exploitation of CVE-2025-54458 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-j66h-xhpr-7q5g, GO-2025-3867.