Vulnerability · Published Aug 11, 2025 · Assigned by Mattermost
CVE-2025-8285Unauthorized Channel Subscription Creation in Mattermost Confluence Plugin
Medium 4.0
In plain English
A medium-severity missing authorization in Mattermost Confluence Plugin from Mattermost. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)4.0Medium
Exploit odds (30 days)0.2%top 88.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/mattermost/mattermost-plugin-confluence | 1.5.0 | GHSA-qjrx-j8wm-xf83 |
| Go | github.com/mattermost/mattermost-plugin-confluence | 1.5.0 | GO-2025-3868 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost Confluence Plugin | 0 – before 1.5.0 |
Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N