{"cve":"CVE-2021-34644","nvd":{"published":"2021-08-16T19:15:14.553","modified":"2026-06-17T03:56:17.463","status":"Modified","description":"The Multiplayer Games WordPress plugin is vulnerable to Reflected Cross-Site Scripting due to the use of $_SERVER['PHP_SELF'] in the ~/multiplayergames.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 3.7.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1},"cwes":["CWE-79"],"references":["https://plugins.trac.wordpress.org/browser/multiplayer-plugin/trunk/multiplayergames.php#L662","https://www.wordfence.com/vulnerability-advisories/#CVE-2021-34644","https://plugins.trac.wordpress.org/browser/multiplayer-plugin/trunk/multiplayergames.php#L662","https://www.wordfence.com/vulnerability-advisories/#CVE-2021-34644"],"products":["multiplayer-plugin_project:multiplayer-plugin"],"source":"nvd","synced_at":"2026-10-19T21:21:57.125947417+00:00"},"epss":{"cve":"CVE-2021-34644","score":0.00938,"percentile":0.60905,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}