XSS in Unified Search via Unescaped Host/Service Names
Priority LOW 38CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
Stored cross-site scripting (XSS) in Checkmk 2.5.0 (beta) before 2.5.0b2 allows authenticated users with permission to create hosts or services to execute arbitrary JavaScript in the browsers of other users performing searches in the Unified Search feature.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0015 4th percentileScored 2026-11-07
Fix Fixed Checkmk (Checkmk GmbH): 2.5.0b2
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Checkmk GmbH | Checkmk | 2.5.0b1 to before 2.5.0b2 | 2.5.0b2 | Patch available | CNA |
- Checkmk VendorCheckmk GmbH Affected 2.5.0b1 to before 2.5.0b2 Fixed in 2.5.0b2 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:checkmk:checkmk:2.5.0:b1:*:*:*:*:*:* | 2.5.0 b1 | Vulnerable | Checkmk GmbH |
- cpe:2.3:a:checkmk:checkmk:2.5.0:b1:*:*:*:*:*:* Versions 2.5.0 b1 Vulnerable ·Checkmk GmbH
Remediation
- Fix · CNA Checkmk (Checkmk GmbH) Fixed in 2.5.0b2
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
Checkmk 2.5.0b2
2 records Highest priority Priority LOW 2 LOW
Other records, highest priority first
- TI-2026-16938 Stored cross-site scripting in Pending Changes sidebarPriority LOW 38
Timeline
- 2026-10-02 Threatist record created from CVE-2026-33276
- 2026-10-03 Alias added: GHSA-h3c2-xwq9-6ph4
References
Advisory 1
More Checkmk GmbH Checkmk vulnerabilities
- TI-2025-26345 Cross Site Scripting through compromised remote site CVSS 4.0HIGH 8.5
- TI-2025-40190 Cross-site scripting in HTML logs of Synthetic Monitoring test services CVSS 4.0HIGH 7.3
- TI-2024-19037 Brute-force protection ineffective for some login methods CVSS 3.1CRITICAL 9.8
- TI-2024-05712 local IP restriction of internal HTTP endpoints CVSS 3.1CRITICAL 9.8
- TI-2021-17818 The web management console of CheckMK Enterprise Edition (versions 1.5.0 to 2.0.0p9) does… CVSS 3.1HIGH 8.8
- TI-2021-17817 The web management console of CheckMK Raw Edition (versions 1.5.0 to 1.6.0) allows a… CVSS 3.1HIGH 8.8
Sources
- CVE-2026-33276 · CVE Program
- CVE-2026-33276 · NVD
- FIRST EPSS
- GHSA-h3c2-xwq9-6ph4 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences