Leantime has Host Header Injection VulnerabilityGHSA-99r5-84gr-59f6
MEDIUMGHSA-99r5-84gr-59f6 is a medium-severity (CVSS 6.5) vulnerability in leantime/leantime. A fix is available for leantime/leantime — see the affected versions and patch details below.
Real-World Exposure
leantime/leantimeReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.
Description
Summary
A host header injection vulnerability has been identified in the user details viewing functionality of the system. This vulnerability allows an attacker to manipulate the host header in HTTP requests, thereby gaining unauthorized access to view details of other users.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | leantime/leantime | all versions | 3.1.2composer require leantime/leantime:^3.1.2 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for leantime/leantime, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update leantime/leantime to 3.1.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-99r5-84gr-59f6 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.
Frequently Asked Questions
Is GHSA-99r5-84gr-59f6 in your dependencies?
Find it across Packagist, including transitive dependencies.