Medium (5.3) in mattermost confluence. EPSS 0.2% chance of exploitation in the next 30 days. Fixed in github.com/mattermost/mattermost-plugin-confluence 1.5.0.
Mattermost Confluence Plugin version <1.5.0 fails to check the access of the user to the channel which allows attackers to create channel subscription without proper access to the channel via API call to the create channel subscription endpoint.
Severity
CVSS 3.1
5.3 medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS
0.2% chance of exploitation in the next 30 days; higher than 9% of CVEs (scores of 2026-10-31)