CVE-2026-80195 kimai CVE debrief

Who should care

Authenticated team members with permission to edit teams, Kimai administrators, and users with access to the team update API endpoint should be aware of this vulnerability and take necessary precautions to prevent unauthorized access. Team leads and members should verify team membership and exercise caution when updating team members to prevent disruptions to team-based access control. Additionally, security teams and vulnerability management teams should review the CVE record and NVD entry to understand the affected scope, severity, and vendor guidance. Operators and platform administrators should also be aware of this vulnerability and plan for vendor-supported updates or mitigations through normal change control where exposure is confirmed. Security teams should review compensating controls for exposed systems while remediation is scheduled and verified, and track exceptions, retest remediated assets, and close the item only after evidence is documented. Asset inventory and monitoring teams should check relevant monitoring, detection, and logs for exposed assets that need extra review. Rollback/change windows teams should plan for potential rollbacks in case of issues during remediation. Source tracking teams should verify the accuracy of the CVE record and track any changes to the vulnerability details. Overall, a coordinated effort is required across various teams to effectively manage and mitigate this vulnerability. To further enhance security, teams should consider implementing additional security measures such as monitoring and detection, asset inventory management, and incident response planning. By taking a proactive and multi-faceted approach, organizations can minimize the risk associated with this vulnerability and protect their systems and data. It is also essential to review and update incident response plans to ensure they are aligned with the latest threat intelligence and vulnerability information. Furthermore, teams should prioritize patching and updating affected systems, as well as implementing compensating controls to prevent exploitation. By doing so, organizations can reduce the likelihood of a successful attack and minimize potential,

Technical summary

The team update API endpoint (PATCH /api/teams/{id}) in Kimai before 2.63.0 is vulnerable to a business logic / improper authorization issue. When updating a team, the endpoint removes all existing team members before validating the submitted replacement member list. This behavior allows an authenticated team lead to submit a malformed members payload, which can bypass the dedicated member-removal endpoint's protection against removing team leads. Consequently, team-based access control can be disrupted, potentially leaving a team with no members or team leads. To mitigate this vulnerability, it is essential to restrict access to the team update API endpoint and implement compensating controls to monitor and track changes to team membership.

Defensive priority

Authenticated team members with permission to edit teams should verify team membership and exercise caution when updating team members to prevent unauthorized access.

Recommended defensive actions

• Verify team membership and exercise caution when updating team members to prevent unauthorized access
• Implement compensating controls to monitor and track changes to team membership
• Restrict access to team update API endpoint to authorized users only
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and NVD entry provide details on the business logic / improper authorization vulnerability in Kimai before 2.63.0. The team update API endpoint (PATCH /api/teams/{id}) removes existing team members before validating the submitted replacement member list, allowing an authenticated team lead to submit a malformed members payload.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.