vulnerability / NVI-00003456 / Revision 2
Kimai has Missing Voter Check that Allows Cross-Team Timesheet Manipulation
OSV carries this publisher advisory for kimai/kimai. This is an aggregated source copy; consult the original publisher and compare update dates.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
8.8 HIGH (3.1)
disclosure@vulncheck.com severity; no combined Null risk score.
9.3 CRITICAL (4.0)
disclosure@vulncheck.com severity; no combined Null risk score.
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
kimai/kimai
source listedECOSYSTEM: introduced 0; fixed 2.56.0
### Summary Any ROLE_TEAMLEAD user can enumerate, read, modify, and permanently delete timesheets belonging to any other user in the system — regardless of team membership. This enables data destruction (deleted billable hours), data tampering (forged timesheet durations), and full authorization bypass on timesheet resources. Verified against Kimai 2.52.0. ### Details `TimesheetVoter::voteOnAttribute()` maps permissions to `own_timesheet` or `other_timesheet` without checking team membership. The voter's own comment confirms this is a known gap: ```php // extend me for "team" support later on if ($subject->getUser()?->getId() === $user->getId()) { $permission .= 'own'; } else { $permission .= 'other'; } ``` ### PoC Tested against Kimai 2.52.0 Docker instance. Setup: - User A (usera, ROLE_TEAMLEAD) owns timesheet ID 2 with description "Private timesheet - UserA only" - User B (userb, ROLE_TEAMLEAD) is NOT on any team with User A **User B reads User A's timesheet data:** ``` GET /api/timesheets/2 HTTP/1.1 X-AUTH-USER: userb X-AUTH-TOKEN: ``` Response: HTTP 200 — returns full timesheet record including description "Private timesheet - UserA only".
03 / Response
What to do next
- vendor patch
The original advisory lists fixed boundaries 2.56.0 for kimai/kimai. Confirm the publisher’s latest guidance.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. GitHub Advisory Database via OSV
- investigate
Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. NIST National Vulnerability Database
A fixed release is not deployment evidence.
Check current vendor support and compatibility. After making a change, verify the deployed build and relevant runtime conditions. Keep the evidence, owner and time. An updated lockfile alone does not prove what is running.
04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
- NVD lastModified does not establish freshness of every associated CPE record.
05 / Provenance
Sources you can inspect
Each assertion retains its source. Mirrored records may repeat one underlying publisher; additional links are not independent corroboration.
- GHSA-9g2q-w3w2-vf7q ↗
GitHub Advisory Database via OSV · vendor advisory
Observed . GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.
- CVE-2026-80202 ↗
NIST National Vulnerability Database · official catalog
Observed . This product uses data from the NVD API but is not endorsed or certified by the NVD.
Public revision history
Only published revisions appear here. Routine fetches do not create a material-change event.
- Revision 2 ·
Source facts changed; compare the preserved prior revision.
- Revision 1 ·
First indexed by Null; source disclosure date is shown separately.