VDB
GO-2026-4459
GO-2026-4459
PUBLISHED
CVSS 9.300000190734863 CRITICAL
Mattermost Server vulnerable to XSS through channel headers in github.com/mattermost/mattermost-server
Risk Scores
CVSS v4.0
9.300000190734863
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| github.com | mattermost/mattermost-server | 3.10.0+incompatible, 3.10.0+incompatible |
Timeline
- Feb 17, 2026 CVE Published
- Feb 19, 2026 CVE Updated
- May 1, 2026 Security Advisory
References
- https://github.com/advisories/GHSA-42x9-rr3c-gr59 advisory
- https://nvd.nist.gov/vuln/detail/CVE-2017-18907 advisory
- https://github.com/mattermost/mattermost/commit/312269ad0bd166174f07f9df7391fce714601600 url
- https://github.com/mattermost/mattermost/commit/4519b03d95e8bfe1b2f74094673ae1a2f39f6b47 url
- https://github.com/mattermost/mattermost/commit/a18479df0940be8503c9b88993490741793eba9e url
- https://mattermost.com/security-updates url