CVE-2026-14452: Open redirect and XSS via reset_url parameter

Severity: high (CVSS 8.6 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-16 · updated 2026-10-16
Weakness: CWE-601

Description

Improper validation of the reset_url parameter of the Setup in-page search in Checkmk <2.5.0p15, <2.4.0p38, <2.3.0p51 and 2.2.0 (EOL) allows an attacker to execute arbitrary script in the session of an authenticated user with Setup access, or to redirect that user to an arbitrary external site, by tricking the user into opening a crafted URL and clicking the Reset button or submitting an empty search.

Affected products

Checkmk GmbH Checkmk: from 2.5.0 before 2.5.0p15; from 2.4.0 before 2.4.0p38; from 2.3.0 before 2.3.0p51; 2.2.0 — fixed in 2.3.0p51, 2.4.0p38, 2.5.0p15

How to fix

Upgrade to a fixed version: Checkmk GmbH Checkmk 2.3.0p51, 2.4.0p38, 2.5.0p15. Check the vendor advisory for mitigations.

References

https://checkmk.com/werk/22314

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