CVE-2026-4267 json
Query Monitor <= 3.20.3 - Reflected Cross-Site Scripting via Request URI
published 7mo ago modified 3mo ago also EUVD-2026-17397 , GHSA-2xr4-chcf-vmvf
- cvss
- 7.2
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 23%
- public exploits
- 0
- none known
Summary
The Query Monitor – The developer tools panel for WordPress plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the ‘$_SERVER['REQUEST_URI']’ parameter in all versions up to, and including, 3.20.3 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.
Patch / fix
- packagist johnbillion/query-monitor 3.20.4
Is CVE-2026-4267 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 7mo ago
Exploit prediction
0.31% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |
| GitHub | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | johnbillion/query-monitor | <3.20.4 |
3.20.4 |
Affected products
- johnbillion Query Monitor
Classification
- Weakness
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/0b75cad9-9f76-4839-8eb2-40d84662846d?source=cve
- plugins.trac.wordpress.org /browser/query-monitor/tags/3.20.2/output/html/request.php#L60
- plugins.trac.wordpress.org /browser/query-monitor/tags/3.20.2/output/html/request.php#L70
- plugins.trac.wordpress.org /changeset/3486705/query-monitor
- research.cleantalk.org /cve-2026-4267/
-
github.com
/johnbillion/query-monitor/security/advisories/GHSA-2xr4-chcf-vmvf
web
-
github.com
/johnbillion/query-monitor
package
Sources
- CVE List CVE-2026-4267
- GitHub Advisory GHSA-2xr4-chcf-vmvf
- NVD CVE-2026-4267
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