{"id":"CVE-2021-34667","aliases":["EUVD-2021-21317","GHSA-r68r-w4gj-642m"],"status":"published","title":"Calendar_plugin \u003c= 1.0 Reflected Cross-Site Scripting","description":"The Calendar_plugin WordPress plugin is vulnerable to Reflected Cross-Site Scripting due to the use of `$_SERVER['PHP_SELF']` in the ~/calendar.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 1.0.","severity":{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00895,"percentile":0.5982,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2021-08-16T18:22:49Z","modified":"2026-06-17T03:56:20Z","products":[{"vendor":"calendar_plugin","product":"calendar_plugin"},{"vendor":"calendar_plugin_project","product":"calendar_plugin"}],"references":[{"url":"https://www.wordfence.com/vulnerability-advisories/#CVE-2021-34667","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://plugins.trac.wordpress.org/browser/calendar-plugin/trunk/calendar.php#L86","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-34667"},{"url":"https://github.com/advisories/GHSA-r68r-w4gj-642m"}],"sources":{"cve":[{"id":"CVE-2021-34667","title":"Calendar_plugin \u003c= 1.0 Reflected Cross-Site Scripting","description":"The Calendar_plugin WordPress plugin is vulnerable to Reflected Cross-Site Scripting due to the use of `$_SERVER['PHP_SELF']` in the ~/calendar.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 1.0.","status":"published","published":"2021-08-16T18:22:49.894Z","modified":"2025-05-05T18:16:41.613Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:33:11.244759Z"}],"euvd":[{"id":"EUVD-2021-21317","description":"The Calendar_plugin WordPress plugin is vulnerable to Reflected Cross-Site Scripting due to the use of `$_SERVER['PHP_SELF']` in the ~/calendar.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 1.0.","status":"published","published":"2021-08-16T18:22:49Z","modified":"2025-05-05T18:16:41Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T20:32:55.636374Z"}],"ghsa":[{"id":"GHSA-r68r-w4gj-642m","title":"The Calendar_plugin WordPress plugin is vulnerable to Reflected Cross-Site Scripting due to the...","description":"The Calendar_plugin WordPress plugin is vulnerable to Reflected Cross-Site Scripting due to the use of `$_SERVER['PHP_SELF']` in the ~/calendar.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 1.0.","status":"published","published":"2022-05-24T19:11:11Z","modified":"2023-01-30T05:01:32Z","cwes":["CWE-79"],"updated_at":"2026-11-02T14:46:25.989719Z"}],"nvd":[{"id":"CVE-2021-34667","description":"The Calendar_plugin WordPress plugin is vulnerable to Reflected Cross-Site Scripting due to the use of `$_SERVER['PHP_SELF']` in the ~/calendar.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 1.0.","status":"published","published":"2021-08-16T19:15:15.65Z","modified":"2026-06-17T03:56:20.213Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:06:56.943671Z"}]}}