VDB
GO-2026-4477
GO-2026-4477
PUBLISHED
CVSS 9.300000190734863 CRITICAL
Mattermost Server vulnerable to user account takeover when Single Sign-On OAuth2 is used 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-fpcr-4rr5-hpcp advisory
- https://nvd.nist.gov/vuln/detail/CVE-2017-18906 advisory
- https://github.com/mattermost/mattermost/commit/259ad46f30d0fac2f7c5c14f3b76b2170f7e90c7 url
- https://github.com/mattermost/mattermost/commit/b17fca0d5ee7557e3df1cf1d1da8bd749859e35f url
- https://github.com/mattermost/mattermost/commit/fbc170733e86f09b46ba754dd03304733d2f482f url
- https://mattermost.com/security-updates url