{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/63235?format=json","vulnerability_id":"VCID-5tg2-vh52-5yhc","summary":"When a user loaded a Web Extensions context menu, the Web Extension could access the post-redirect URL of the element clicked.  If the Web Extension lacked the WebRequest permission for the hosts involved in the redirect, this would be a same-origin-violation leaking data the Web Extension should have access to.  This was fixed to provide the pre-redirect URL. This is related to CVE-2021-43532 but in the context of Web Extensions.","aliases":[{"alias":"CVE-2021-43531"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/1105248?format=json","purl":"pkg:deb/debian/firefox@150.0.2-1?distro=sid","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/firefox@150.0.2-1%3Fdistro=sid"},{"url":"http://public2.vulnerablecode.io/api/packages/584097?format=json","purl":"pkg:deb/debian/firefox@94.0-1?distro=sid","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/firefox@94.0-1%3Fdistro=sid"},{"url":"http://public2.vulnerablecode.io/api/packages/582059?format=json","purl":"pkg:deb/debian/firefox@149.0-1?distro=sid","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/firefox@149.0-1%3Fdistro=sid"},{"url":"http://public2.vulnerablecode.io/api/packages/1059611?format=json","purl":"pkg:deb/debian/firefox@149.0.2-1?distro=sid","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/firefox@149.0.2-1%3Fdistro=sid"},{"url":"http://public2.vulnerablecode.io/api/packages/1076056?format=json","purl":"pkg:deb/debian/firefox@150.0-1?distro=sid","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/firefox@150.0-1%3Fdistro=sid"},{"url":"http://public2.vulnerablecode.io/api/packages/1088670?format=json","purl":"pkg:deb/debian/firefox@150.0.1-1?distro=sid","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/firefox@150.0.1-1%3Fdistro=sid"}],"affected_packages":[],"references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-43531","reference_id":"","reference_type":"","scores":[{"value":"0.00085","scoring_system":"epss","scoring_elements":"0.24523","published_at":"2026-05-07T12:55:00Z"},{"value":"0.00085","scoring_system":"epss","scoring_elements":"0.24624","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00085","scoring_system":"epss","scoring_elements":"0.24613","published_at":"2026-04-26T12:55:00Z"},{"value":"0.00085","scoring_system":"epss","scoring_elements":"0.24569","published_at":"2026-04-29T12:55:00Z"},{"value":"0.00085","scoring_system":"epss","scoring_elements":"0.24447","published_at":"2026-05-05T12:55:00Z"},{"value":"0.00085","scoring_system":"epss","scoring_elements":"0.24667","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00085","scoring_system":"epss","scoring_elements":"0.24735","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00085","scoring_system":"epss","scoring_elements":"0.24782","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00085","scoring_system":"epss","scoring_elements":"0.24795","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00085","scoring_system":"epss","scoring_elements":"0.24754","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00085","scoring_system":"epss","scoring_elements":"0.24698","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00085","scoring_system":"epss","scoring_elements":"0.24712","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00085","scoring_system":"epss","scoring_elements":"0.24704","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00085","scoring_system":"epss","scoring_elements":"0.24683","published_at":"2026-04-21T12:55:00Z"},{"value":"0.00138","scoring_system":"epss","scoring_elements":"0.33582","published_at":"2026-04-01T12:55:00Z"},{"value":"0.00138","scoring_system":"epss","scoring_elements":"0.33913","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00138","scoring_system":"epss","scoring_elements":"0.33945","published_at":"2026-04-04T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-43531"},{"reference_url":"https://www.mozilla.org/en-US/security/advisories/mfsa2021-48","reference_id":"mfsa2021-48","reference_type":"","scores":[{"value":"high","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.mozilla.org/en-US/security/advisories/mfsa2021-48"}],"weaknesses":[],"exploits":[],"severity_range_score":"7.0 - 8.9","exploitability":null,"weighted_severity":null,"risk_score":null,"resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-5tg2-vh52-5yhc"}