Checkmk: Open redirect and XSS in Setup in-page search
Summary
The reset_url parameter of the Setup in-page search in Checkmk is not validated. An attacker can craft a URL that runs script in the session of a logged-in user with Setup access, or redirects that user to an external site. The attack requires the victim to open the crafted URL and click Reset or submit an empty search.
Affected
- Checkmk 2.5.0 before 2.5.0p15
- Checkmk 2.4.0 before 2.4.0p38
- Checkmk 2.3.0 before 2.3.0p51
- Checkmk 2.2.0 (EOL, no fixed build listed; affected per CNA record, default unaffected per CNA)
Fixed in
- Checkmk 2.5.0p15
- Checkmk 2.4.0p38
- Checkmk 2.3.0p51
- The vendor werk lists 2.4.0p39 and 2.3.0p52 as releases containing the fix. Verify the exact versions against the werk before change planning.
- Unknown whether a fixed 2.2.0 build exists. Upgrade to a supported branch.
Workaround
Unknown. No vendor-documented workaround was found. The fix restricts reset_url to same-origin relative URLs.
Exploitation
- CISA SSVC: exploitation none, not automatable, total technical impact
- VulDB: no exploit available
- Strix: not listed in KEV
- No public proof of concept found in research; this does not prove that none exists
Our recommendation
- Upgrade to 2.5.0p15, 2.4.0p38, 2.3.0p51 or later in the next regular maintenance window, or sooner if Checkmk is reachable from the internet or used by many administrators.
- Migrate any 2.2.0 instance, as it cannot be patched in place.
- Limit the number of accounts with Setup rights.
- Tell administrators not to open unexpected Checkmk links received by email or chat.
- Check web server access logs for reset_url values containing javascript: or foreign hosts.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Checkmk Werk #22314 (vendor advisory) checkmk.com
- VulDB CVE-2026-14452 vuldb.com
- CVE record mirror (threatint) cve.threatint.com
- Vulners NVD record vulners.com
- Strix CVE-2026-14452 www.strix.ai
- Cystack Checkmk GmbH vulnerabilities cystack.net
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 1 Nov 2026, 07:54.
Original description (NVD)
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.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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