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Vulnerability record · CVE-2026-15780 · published 19 August 2026

CVE-2026-15780: Cross-site scripting vulnerability

The WP Statistics – Simple, privacy-friendly Google Analytics alternative plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'utm_campaign' parameter in all versions up to, and including, 14.16.8 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The payload can be planted without authentication via the public /wp-statistics/v2/hit REST endpoint, because the required signature is exposed on the public homepage and a base64-encoded page_uri POST parameter overrides the previously sanitized REQUEST_URI, allowing the malicious utm_campaign value to bypass sanitization and be stored in the database.

7.2 CVSS 3.1 High EPSS 0.65% · top 51.1% CWE-79 · Cross-site scripting Deferred
7.2CVSS 3.1 base score
0.65%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
14References
20 Aug 2026Last modified by NVD

Description

The WP Statistics – Simple, privacy-friendly Google Analytics alternative plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'utm_campaign' parameter in all versions up to, and including, 14.16.8 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The payload can be planted without authentication via the public /wp-statistics/v2/hit REST endpoint, because the required signature is exposed on the public homepage and a base64-encoded page_uri POST parameter overrides the previously sanitized REQUEST_URI, allowing the malicious utm_campaign value to bypass sanitization and be stored in the database.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

References

LinkTags
https://github.com/wp-statistics/wp-statistics/commit/6ab74427778b89c9e88471e9dd7407d9055a9b34
https://plugins.trac.wordpress.org/browser/wp-statistics/tags/14.16.7/assets/dev/javascript/helper.js#L267
https://plugins.trac.wordpress.org/browser/wp-statistics/tags/14.16.7/includes/api/v2/class-wp-statistics-api-hit.php#L7
https://plugins.trac.wordpress.org/browser/wp-statistics/tags/14.16.7/includes/class-wp-statistics-helper.php#L1462
https://plugins.trac.wordpress.org/browser/wp-statistics/tags/14.16.7/includes/class-wp-statistics-hits.php#L102
https://plugins.trac.wordpress.org/browser/wp-statistics/tags/14.16.7/views/components/tables/referred-visitors.php#L79
https://plugins.trac.wordpress.org/browser/wp-statistics/tags/14.16.7/views/components/tables/visitors.php#L94
https://plugins.trac.wordpress.org/browser/wp-statistics/tags/14.16.8/assets/dev/javascript/helper.js#L267
https://plugins.trac.wordpress.org/browser/wp-statistics/tags/14.16.8/includes/api/v2/class-wp-statistics-api-hit.php#L7
https://plugins.trac.wordpress.org/browser/wp-statistics/tags/14.16.8/includes/class-wp-statistics-helper.php#L1462
https://plugins.trac.wordpress.org/browser/wp-statistics/tags/14.16.8/includes/class-wp-statistics-hits.php#L102
https://plugins.trac.wordpress.org/browser/wp-statistics/tags/14.16.8/views/components/tables/referred-visitors.php#L79
https://plugins.trac.wordpress.org/browser/wp-statistics/tags/14.16.8/views/components/tables/visitors.php#L94
https://www.wordfence.com/threat-intel/vulnerabilities/id/b5baecfe-ce0b-4cec-8462-bfd7eadd41e9?source=cve

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Source: NIST National Vulnerability Database (record CVE-2026-15780), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.