CVE-2025-53857: Mattermost Confluence Plugin has Missing Authorization vulnerability

August 11, 2025

Mattermost Confluence Plugin versions < 1.5.0 fail to check user access to the channel, allowing attackers to get channel subscription details without proper access to the channel via API call to the GET autocomplete/GetChannelSubscriptions endpoint.

References

github.com/advisories/GHSA-42m6-5vm7-fjv2
github.com/mattermost/mattermost-plugin-confluence
mattermost.com/security-updates
nvd.nist.gov/vuln/detail/CVE-2025-53857

Code Behaviors & Features

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