GHSA-4r67-4x4p-fprg
MEDIUMGHSA-4r67-4x4p-fprg is a medium-severity (CVSS 4.1) CWE-90 vulnerability in github.com/mattermost/mattermost/server/v8. O3 Security confirms whether GHSA-4r67-4x4p-fprg is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Mattermost allows authenticated administrator to execute LDAP search filter injection
Blast Radius
github.com/mattermost/mattermost/server/v8🐹github.com/mattermost/mattermost-server🐹github.com/mattermost/mattermost-server🐹github.com/mattermost/mattermost-server🐹github.com/mattermost/mattermost-serverReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
Mattermost versions 10.7.x <= 10.7.1, 10.6.x <= 10.6.3, 10.5.x <= 10.5.4, 9.11.x <= 9.11.13 fail to properly validate LDAP group ID attributes, allowing an authenticated administrator with PermissionSysconsoleWriteUserManagementGroups permission to execute LDAP search filter injection via the PUT /api/v4/ldap/groups/{remote_id}/link API when objectGUID is configured as the Group ID Attribute.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | github.com/mattermost/mattermost/server/v8 | all versions | 8.0.0-20250414112942-77892234944b |
| 🐹Go | github.com/mattermost/mattermost-server | ≥ 10.7.0&&< 10.7.2 | 10.7.2 |
| 🐹Go | github.com/mattermost/mattermost-server | ≥ 10.6.0&&< 10.6.4 | 10.6.4 |
| 🐹Go | github.com/mattermost/mattermost-server | ≥ 10.5.0&&< 10.5.5 | 10.5.5 |
| 🐹Go | github.com/mattermost/mattermost-server | ≥ 9.11.0&&< 9.11.14 | 9.11.14 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/mattermost/mattermost/server/v8. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update github.com/mattermost/mattermost/server/v8 to 8.0.0-20250414112942-77892234944b or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-4r67-4x4p-fprg is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-4r67-4x4p-fprg is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-4r67-4x4p-fprg. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-4r67-4x4p-fprg in your dependencies?
O3 detects GHSA-4r67-4x4p-fprg across Go dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.