GO-2025-4200
NoneCVSS
—
EPSS
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Published
Dec 15, 2025
CISA due date
—
The record
Mattermost Server allows attackers to gain privileges by accessing unintended API endpoints with users' credentials in github.com/mattermost/mattermost-server
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | 0 | 4.1.2+incompatible |
| Go | github.com/mattermost/mattermost-server | 0 | 4.1.2 |
| Go | github.com/mattermost/mattermost-server | 4.2.0-rc1 | 4.2.1 |
| Go | github.com/mattermost/mattermost-server | 4.3.0-rc1 | 4.3.0 |
| go | github.com/mattermost/mattermost-server | 4.2.0-rc1 | 4.2.1 |
| go | github.com/mattermost/mattermost-server | 4.3.0-rc1 | 4.3.0 |
Related vulnerabilities
- GO-2026-4305 Mattermost Server vulnerable to CSRF if CORS is enabled in… Also affects github.com/mattermost/mattermost-server
- GO-2025-4259 Mattermost doesn't validate user channel membership when attaching Mattermost posts as… Also affects github.com/mattermost/mattermost-server
- GO-2026-4326 Mattermost is vulnerable to DoS due to infinite re-renders on API errors in… Also affects github.com/mattermost/mattermost-server
- GO-2025-4260 Mattermost doesn't verify that post actions invoking `/share-issue-publicly` were created… Also affects github.com/mattermost/mattermost-server
- GO-2026-4325 Mattermost is vulnerable to CPU exhaustion via crafted HTTP request in… Also affects github.com/mattermost/mattermost-server
- GO-2026-4282 Mattermost Server is vulnerable to channel invisibility DoS via misformatted post in… Also affects github.com/mattermost/mattermost-server
- GO-2026-4496 Mattermost doesn't validate user permissions when creating Jira issues from Mattermost… Also affects github.com/mattermost/mattermost-server
- GO-2026-4520 Mattermost fails to properly validate login method restrictions in… Also affects github.com/mattermost/mattermost-server