Nagios Core / XI DOM-based XSS via jsonquery.js
Published Aug 12, 2026
5.1
MEDIUMCVSS 4.0
EPSS 0.29%
Description
Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 are vulnerable to DOM-based cross-site scripting in jsonquery.js. Unencoded JSON string values reflected from stored fields are inserted into the DOM without sanitization, allowing attackers to run arbitrary JavaScript in the victim's browser.
Affected products
-
- Version 0StatusaffectedConstraints<4.5.14
- Version
-
- Version 0StatusaffectedConstraints<2026R1.7
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Nagios Enterprises, LLC. | Nagios Core | affected |
| ||||||
| Nagios Enterprises, LLC. | Nagios XI | affected |
|
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
1 other source (NVD) ▾
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed Aug 12, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 4, 2026.
Score over time
Aug-Oct 2026- EPSS v5
Percentile over time
- EPSS v5
Table of values (2 key points)
Flat stretches are collapsed. Showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 4, 2026 | 0.29% (0.00289) | 19.47th | v5 (v2026.06.15) |
| Aug 13, 2026 | 0.17% (0.00165) | 6.19th | v5 (v2026.06.15) |
References (3)
- https://github.com/NagiosEnterprises/nagioscore/blob/master/Changelog release-notes
- https://www.nagios.com/security-disclosures/nagios-core/ vendor-advisorypatch
- https://www.vulncheck.com/advisories/nagios-core-xi-dom-based-xss-via-jsonquery-js third-party-advisory
| Link | Providers | Tags |
|---|---|---|
| https://github.com/NagiosEnterprises/nagioscore/blob/master/Changelog | release-notes | |
| https://www.nagios.com/security-disclosures/nagios-core/ | vendor-advisorypatch | |
| https://www.vulncheck.com/advisories/nagios-core-xi-dom-based-xss-via-jsonquery-js | third-party-advisory |
Change history (0)
No recorded changes yet.