GHSA-cj3c-5xpm-cx94
MEDIUMKimai API returns timesheet entries a user should not be authorized to view
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
Blast Radius
kimai/kimaiReal-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
The permission view_other_timesheet performs differently for the Kimai UI and the API, thus returning unexpected data through the API.
Details
When setting the view_other_timesheet permission to true, on the frontend, users can only see timesheet entries for teams they are a part of. When requesting all timesheets from the API, however, all timesheet entries are returned, regardless of whether the user shares team permissions or not.
Example:
There are projects P1 and P2, Teams T1 and T2, users U1 and U2 and Timesheet entries E1 and E2. U1 is team leader of team T1 and has access to P1. U2 is in Team T2 and has access to both P1 and P2. U2 creates E1 for P1 and E2 for P2.
In the UI, U1 with view _other_timesheet perms sees E1 as he is a part of T1 that has access to P1.
In the API, however, he has access to E1 and E2.
Additionally, if U1 is not a team leader T1, he does not see any timesheet from a user other than himself in the UI, but still all timesheets in the API.
PoC
- Give a user
view_other_timesheetpermission - The result of the UI and the API call to
/api/timesheets?user=alldiffers in the data that is being returned
Curl command:
curl -X 'GET' \
'https://kimai.instance.com/api/timesheets?user=all' \
-H 'accept: application/json' \
-H 'X-AUTH-USER: username' \
-H 'X-AUTH-TOKEN: api_token'
Impact
This is at least an insufficient granularity of access control weakness. People can see timesheet entries they are not supposed to. This greatly affects the confidentiality of timesheet entries.
Restricting API access to administrators is also not a valid solution, as API access is needed, for example, to use the mobile app.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | kimai/kimai | all versions | 2.13.0 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for kimai/kimai. 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 kimai/kimai to 2.13.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-cj3c-5xpm-cx94 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-cj3c-5xpm-cx94 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-cj3c-5xpm-cx94. 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-cj3c-5xpm-cx94 in your dependencies?
O3 detects GHSA-cj3c-5xpm-cx94 across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.