Is Query Monitor safe to use?

Laskyr does not give safety verdicts. No known unpatched vulnerabilities in the latest version (4.1.1). As of 2026-11-04. 1 issue is on record for older versions; version 3.20.4 or newer fixes all of them that state a fix. Keep Query Monitor on the latest version (4.1.1) and remove it if you do not use it.

Which versions of Query Monitor are vulnerable?

Known issues on record (newest first): Reflected cross-site scripting (XSS) (3.20.3 and older, fixed in 3.20.4). The full list with sources is on this page.

What is the latest version of Query Monitor?

4.1.1, according to wordpress.org (last updated 2026-10-27). It has 200,000+ active installs.

What should I do if my Query Monitor is out of date?

Take a backup, then update it from Dashboard > Updates (or run wp plugin update query-monitor). If you cannot update right away, deactivate it until you can. If you think the site was already attacked, run a free scan at https://laskyr.com/scan.

Plugins · query-monitor · data as of 2026-11-04

Is Query Monitor safe? Known vulnerabilities and latest version

Latest version: 4.1.1
Last updated: 2026-10-27
Active installs: 200,000+
Known issues on record: 1
Unpatched in latest: 0
Tested up to WP: 7.1.4 · PHP 7.4+

Query Monitor is the developer tools panel for WordPress and WooCommerce. — by John Blackbourn

What to do

Update to the latest version (4.1.1). Anything older than 3.20.4 has at least one known issue listed below. Dashboard → Updates, or Plugins → “update now”.
If you cannot update right away, deactivate it until you can.
Turn on auto-updates for it: Plugins → “Enable auto-updates” on its row.
If you ran a vulnerable version and something looks off (spam pages, strange admins, redirects), run the free scan.

With WP-CLI: wp plugin get query-monitor --field=version shows what you run; wp plugin update query-monitor updates it.

Check your version

Known vulnerabilities

1 on record, newest first. “Affected” is the version range the source gives; “fixed in” is the version the source names, or (marked *) the first wordpress.org release after the last affected version.

high 7.2 CVE-2026-4267 · published 2026-03-31

Reflected cross-site scripting (XSS) in Query Monitor (3.20.3 and older)

Affected: 3.20.3 and older
Fixed in: 3.20.4 *
Access needed (per CVSS): No login needed
Range from: CVE record (the advisory publisher) · score by Wordfence

Details from the advisory

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.

NVD CVE-2026-4267 Wordfence advisory Code change (fix)research.cleantalk.org Plugin source

Recent activity

2026-10-27 — latest release on wordpress.org (4.1.1).
2026-03-31 — Reflected cross-site scripting (XSS) disclosed (CVE-2026-4267), fixed in 3.20.4.

Free. We check the CVE feeds every day and email you only when a new issue for Query Monitor (query-monitor) is published or a fix ships. Unsubscribe in one click.

Browse vulnerabilities

Types found in this plugin: Cross-site scripting (XSS) (1)

Where this data comes from

Version, last update, installs: wordpress.org/plugins/query-monitor (Plugins API), fetched 2026-11-04.
Vulnerabilities: NIST National Vulnerability Database (NVD), checked 2026-11-04. This product uses data from the NVD API but is not endorsed or certified by the NVD.
Each record links to its CVE page and to the original advisory (Wordfence, Patchstack or WPScan) where there is one. We only list a CVE here when its references or its advisory name this exact plugin, so a few real issues may be missing; none should be about a different plugin. Spot an error? Email Daniel.

Badge for your site or docs (states facts with a date, not a verdict):

<a href="https://laskyr.com/plugins/query-monitor"><img src="https://laskyr.com/plugins/query-monitor/badge.svg" alt="Query Monitor vulnerability status"></a>

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