CVE-2026-80196 (CVSS 7.5)

Description

Kimai before 2.58.0 contains an authentication bypass vulnerability where password reset links remain valid after password changes because the LoginLink signature covers only the user id, not the password hash. Attackers who intercept or cache a password reset link can use it up to 2 additional times within a 1-hour window to log in as the user even after the legitimate user has changed their password.

Is your site exposed to CVE-2026-80196?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS — Exploit Prediction

0.0042

Probability of exploitation

0.36%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-640 CWE-640

References

Other References

https://github.com/kimai/kimai/security/advisories/GHSA-m492-gv72-xvxj https://www.vulncheck.com/advisories/kimai-before-2.58.0-authentication-bypass-via-password-reset-link https://github.com/kimai/kimai/security/advisories/GHSA-m492-gv72-xvxj

Frequently Asked Questions

What is CVE-2026-80196? +

Kimai before 2.58.0 contains an authentication bypass vulnerability where password reset links remain valid after password changes because the LoginLink signature covers only the user id, not the password hash. Attackers who intercept or cache a password reset link can use it up to 2 additional times within a 1-hour window to log in as the user even after the legitimate user has changed their password. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-80196? +

CVE-2026-80196 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0042, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-80196? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2026-18363

A logic vulnerability in the password reset token validation routine implemented by osTicket in versions prior to v1.17.8 and v1.18.4. …

CVE-2026-14850

The password reset funcionality is vulnerable to unauthorized account modification due to improper validation of the user_id parameter. An attacker …

CVE-2025-29995

This vulnerability exists in the CAP back office application due to a weak password-reset mechanism implemented at API endpoints. An …

CVE-2025-53373

Natours is a Tour Booking API. The attacker can easily take over any victim account by injecting an attacker-controlled server …

CVE-2026-81905

Concrete CMS below 9.5.3 stores user validation hashes for multiple purposes (email/registration validation, password reset, and persistent login) in a …

CVE-2026-53646

FOSSBilling is a free, open-source billing and client management system. In versions 0.5.6 through 0.7.2, when a `ClientPasswordReset` record already …

CVE-2026-80196