What is CVE-2026-80197?

CVE-2026-80197 is a medium-severity vulnerability in Kimai, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-08-26.

How severe is CVE-2026-80197?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Kimai

CVE-2026-80197

Kimai before 2.57.0 contains an improper authorization vulnerability in the favorite timesheet add and remove endpoints that allows authenticated users to manipulate other users' bookmarks. Attackers can add or remove timesheet entries from another user's favorite list by referencing their timesheet identifier, enabling cross-user business-state tampering without administrative privileges.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2026-08-26 · last modified 2026-10-08.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (16.8th percentile), scored 2026-10-10.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 16.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001

Affected products

Kimai

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

github.com/kimai/kimai/security/advisories/GHSA-j5mc-p8qg-39j7 (vendor-advisory)
www.vulncheck.com/advisories/kimai-before-2.57.0-improper-authorization-via-fav… (third-party-advisory)

Frequently asked questions

What is CVE-2026-80197?: CVE-2026-80197 is a medium-severity vulnerability in Kimai, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-08-26.
How severe is CVE-2026-80197?: Medium severity. CVSS v3 base score is 4.3 out of 10.