{"id":"CVE-2021-44223","aliases":["BIT-wordpress-2021-44223","BIT-wordpress-multisite-2021-44223","DEBIAN-CVE-2021-44223","EUVD-2021-31072","GHSA-m8cv-g4gv-cx2g","UBUNTU-CVE-2021-44223"],"status":"published","title":"WordPress before 5.8 lacks support for the Update URI plugin header. This makes it easier for...","description":"WordPress before 5.8 lacks support for the Update URI plugin header. This makes it easier for remote attackers to execute arbitrary code via a supply-chain attack against WordPress installations that use any plugin for which the slug satisfies the naming constraints of the WordPress.org Plugin Directory but is not yet present in that directory.","severity":{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AC:H/AV:N/A:H/C:H/I:H/PR:N/S:U/UI:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.28983,"percentile":0.98186,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2021-11-25T14:51:19Z","modified":"2026-10-24T10:30:27Z","fixes":[{"ecosystem":"Bitnami","package":"wordpress","fixed_in":["5.8.0"],"sources":["osv"]},{"ecosystem":"Bitnami","package":"wordpress-multisite","fixed_in":["5.8.0"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"wordpress","fixed_in":["5.8.1+dfsg1-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"wordpress","fixed_in":["5.8.1+dfsg1-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"wordpress","fixed_in":["5.8.1+dfsg1-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Bitnami","package":"wordpress","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"5.8.0"}]}]},{"source":"osv","ecosystem":"Bitnami","package":"wordpress-multisite","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"5.8.0"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"wordpress","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.8.1+dfsg1-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"wordpress","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.8.1+dfsg1-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"wordpress","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.8.1+dfsg1-1"}]}]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"wordpress","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.3+dfsg-1","4.3.1+dfsg-1","4.4+dfsg-1","4.4.1+dfsg-1","4.4.2+dfsg-1","4.4.2+dfsg-1ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"wordpress","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.8.2+dfsg-2","4.8.3+dfsg-1","4.9.1+dfsg-1","4.9.2+dfsg-1","4.9.4+dfsg-1","4.9.5+dfsg1-1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"wordpress","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.2.2+dfsg1-1","5.2.4+dfsg1-1","5.3.2+dfsg1-1","5.3.2+dfsg1-1ubuntu1"]}],"products":[{"vendor":"wordpress","product":"wordpress"}],"references":[{"url":"https://vavkamil.cz/2021/11/25/wordpress-plugin-confusion-update-can-get-you-pwned/","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","advisory","evidence","report"]},{"url":"https://make.wordpress.org/core/2021/06/29/introducing-update-uri-plugin-header-in-wordpress-5-8/","tags":["x_refsource_MISC","x_transferred","Release Notes","Vendor Advisory","advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-44223","tags":["web"]},{"url":"https://github.com/advisories/GHSA-m8cv-g4gv-cx2g"},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-44223","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-44223","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-44223","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-44223","description":"WordPress before 5.8 lacks support for the Update URI plugin header. This makes it easier for remote attackers to execute arbitrary code via a supply-chain attack against WordPress installations that use any plugin for which the slug satisfies the naming constraints of the WordPress.org Plugin Directory but is not yet present in that directory.","status":"published","published":"2021-11-25T14:51:19Z","modified":"2024-08-04T04:17:24.569Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AC:H/AV:N/A:H/C:H/I:H/PR:N/S:U/UI:N","level":"high","assessor":"cna"}],"updated_at":"2026-11-02T14:33:01.166399Z"}],"euvd":[{"id":"EUVD-2021-31072","description":"WordPress before 5.8 lacks support for the Update URI plugin header. 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This makes it easier for remote attackers to execute arbitrary code via a supply-chain attack against WordPress installations that use any plugin for which the slug satisfies the naming constraints of the WordPress.org Plugin Directory but is not yet present in that directory.","status":"published","published":"2022-05-24T19:21:19Z","modified":"2023-01-30T05:03:51Z","updated_at":"2026-11-02T14:46:55.674273Z"}],"nvd":[{"id":"CVE-2021-44223","description":"WordPress before 5.8 lacks support for the Update URI plugin header. This makes it easier for remote attackers to execute arbitrary code via a supply-chain attack against WordPress installations that use any plugin for which the slug satisfies the naming constraints of the WordPress.org Plugin Directory but is not yet present in that directory.","status":"published","published":"2021-11-25T15:15:09.8Z","modified":"2026-06-17T04:12:04.767Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"updated_at":"2026-11-02T14:07:01.428028Z"}],"osv":[{"id":"CVE-2021-44223","description":"WordPress before 5.8 lacks support for the Update URI plugin header. 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