CVE-2026-4267Query Monitor <= 3.20.3 - Reflected Cross-Site Scripting via Request URI
- 7.2HighCVSS base score
- 0.31%Exploitation in 30 daysEPSS · top 76% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Wordfence
- 15 days later
· 15 days later
Published
- 8 days later
· 8 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| WordfenceCNA (assigner) | 3.1 | High7.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |
| NVDNVD · Deferred | 3.1 | High7.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |
- EPSS (exploitation in 30 days)
- 0.31% · top 76% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.2.
Affected products
- affected ≤ 3.20.3
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Packagistjohnbillion/query-monitorGHSA-2xr4-chcf-vmvf (opens in a new tab)
References
References5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/0b75cad9-9f76-4839-8eb2-40d84662846d?source=cve (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/query-monitor/tags/3.20.2/output/html/request.php#L60 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/query-monitor/tags/3.20.2/output/html/request.php#L70 (opens in a new tab)
- https://plugins.trac.wordpress.org/changeset/3486705/query-monitor (opens in a new tab)
- https://research.cleantalk.org/cve-2026-4267/ (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-17397 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-2xr4-chcf-vmvf (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-4267)Record last updated .