CVE-2026-80199

Low

Description

Kimai before 2.54.0 contains a timing oracle vulnerability in TokenAuthenticator that allows unauthenticated attackers to enumerate valid usernames via X-AUTH-USER header. Attackers can measure response time differences when the password hasher runs only for existing users, enabling username enumeration with no login throttling protection.

SeverityLow

CVSS3.7

Exploit probability—

ProductKimai/kimai

PublishedAug 26, 2026

First seenAug 26, 2026

Weakness typeCWE-208CWE-208

How to fix

Update

kimai/kimai2.54.0 or later

Vendor advisories

github.com/kimai/kimai/security/advisories/GHSA-jrc6-fmhw-fpq2

Affected products

Product	Affected versions	Fixed in
kimai/kimaiPackagist	v < 2.54.0	2.54.0

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