CVE-2026-25783
unknown
CVSS v3
—
CVSS v2
—
VIR risk
—
Description
Mattermost fails to properly validate User-Agent header tokens in github.com/mattermost/mattermost-server
Predictions
Exploit likelihood
30%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No vendor mitigations ingested yet for this CVE. The mitigation-content worker queues fetches as references arrive — check back in a few minutes, or see the references list below.
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Go | github.com/mattermost/mattermost/server/v8 | <8.0.0-20260129181235-1346cf529aef | 8.0.0-20260129181235-1346cf529aef |
| Go | github.com/mattermost/mattermost-server | <5.3.2-0.20260129181235-1346cf529aef | 5.3.2-0.20260129181235-1346cf529aef |
| Go | github.com/mattermost/mattermost-server | >=10.11.0-rc1,<10.11.11 | 10.11.11 |
| Go | github.com/mattermost/mattermost-server | >=11.2.0-rc1,<11.2.3 | 11.2.3 |
| Go | github.com/mattermost/mattermost-server | >=11.3.0-rc1,<11.3.1 | 11.3.1 |
| Go | github.com/mattermost/mattermost-server | >=11.3.0-rc1+incompatible,<11.3.1+incompatible | 10.11.11+incompatible |
| Go | github.com/mattermost/mattermost-server/v5 | | |
| Go | github.com/mattermost/mattermost-server/v6 | | |
References
Verify integrity in audit chain (admin only). AS-IS.