{"affected":[{"defaultStatus":"unaffected","ecosystem":"https://wordpress.org/plugins","packageName":"hummingbird-performance","product":"Hummingbird","source":"CNA: Patchstack","vendor":"WPMU DEV","versions":[{"changes":[{"at":"4.0.0","status":"unaffected"}],"lessThanOrEqual":"3.21.2","status":"affected","version":"0","versionType":"custom"}]}],"cveId":"CVE-2026-121763","cwes":["CWE-79"],"description":"Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in WPMU DEV Hummingbird hummingbird-performance allows Stored XSS.This issue affects Hummingbird: from n/a through 3.21.2.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":6.5,"severity":"medium","source":"CNA: Patchstack","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L","version":"3.1"},{"score":6.5,"severity":"medium","source":"NVD: audit@patchstack.com","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L","version":"3.1"}],"modifiedAt":1794219427440,"publishedAt":1794218414148,"references":[{"source":"CNA: Patchstack","tags":["vdb-entry"],"url":"https://patchstack.com/database/wordpress/plugin/hummingbird-performance/vulnerability/wordpress-hummingbird-plugin-3-21-2-cross-site-scripting-xss-vulnerability?_s_id=cve"},{"source":"audit@patchstack.com","tags":[],"url":"https://patchstack.com/database/wordpress/plugin/hummingbird-performance/vulnerability/wordpress-hummingbird-plugin-3-21-2-cross-site-scripting-xss-vulnerability?_s_id=cve"}],"remediation":[{"kind":"fix","source":"CNA: Patchstack","text":"Update the WordPress Hummingbird plugin to the latest available version (at least 4.0.0)."}],"revision":"28ed914f27b94a6c4ff41593fc6707fee4581003ed69950983d7d640d2b36d54","sources":[{"modifiedAt":1794218414148,"name":"CNA: Patchstack","retrievedAt":1794222526199,"url":"https://www.cve.org/CVERecord?id=CVE-2026-121763"},{"modifiedAt":1794219427440,"name":"NVD","retrievedAt":1794226691461,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121763"}],"ssvc":null,"status":"published","title":"WordPress Hummingbird plugin <= 3.21.2 - Cross Site Scripting (XSS) vulnerability","updatedAt":1794226691461}