Vulnerability Instance

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{
    "url": "http://public2.vulnerablecode.io/api/vulnerabilities/1344?format=api",
    "vulnerability_id": "VCID-jf4p-n5ew-v3an",
    "summary": "A malicious extension with the 'search' permission could have installed a new search engine whose favicon referenced a cross-origin URL.  The response to this cross-origin request could have been read by the extension, allowing a same-origin policy bypass by the extension, which should not have cross-origin permissions.  This cross-origin request was made without cookies, so the sensitive information disclosed by the violation was limited to local-network resources or resources that perform IP-based authentication.",
    "aliases": [
        {
            "alias": "CVE-2021-23986"
        }
    ],
    "fixed_packages": [
        {
            "url": "http://public2.vulnerablecode.io/api/packages/2445?format=api",
            "purl": "pkg:alpm/archlinux/firefox@87.0-1",
            "is_vulnerable": false,
            "affected_by_vulnerabilities": [],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:alpm/archlinux/firefox@87.0-1"
        },
        {
            "url": "http://public2.vulnerablecode.io/api/packages/94574?format=api",
            "purl": "pkg:deb/debian/firefox@87.0-1?distro=sid",
            "is_vulnerable": false,
            "affected_by_vulnerabilities": [],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:deb/debian/firefox@87.0-1%3Fdistro=sid"
        },
        {
            "url": "http://public2.vulnerablecode.io/api/packages/94464?format=api",
            "purl": "pkg:deb/debian/firefox@151.0.3-1?distro=sid",
            "is_vulnerable": false,
            "affected_by_vulnerabilities": [],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:deb/debian/firefox@151.0.3-1%3Fdistro=sid"
        },
        {
            "url": "http://public2.vulnerablecode.io/api/packages/193518?format=api",
            "purl": "pkg:ebuild/www-client/firefox@78.10.0",
            "is_vulnerable": false,
            "affected_by_vulnerabilities": [],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:ebuild/www-client/firefox@78.10.0"
        },
        {
            "url": "http://public2.vulnerablecode.io/api/packages/193519?format=api",
            "purl": "pkg:ebuild/www-client/firefox@88.0",
            "is_vulnerable": false,
            "affected_by_vulnerabilities": [],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:ebuild/www-client/firefox@88.0"
        },
        {
            "url": "http://public2.vulnerablecode.io/api/packages/193520?format=api",
            "purl": "pkg:ebuild/www-client/firefox-bin@78.10.0",
            "is_vulnerable": false,
            "affected_by_vulnerabilities": [],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:ebuild/www-client/firefox-bin@78.10.0"
        },
        {
            "url": "http://public2.vulnerablecode.io/api/packages/193521?format=api",
            "purl": "pkg:ebuild/www-client/firefox-bin@88.0",
            "is_vulnerable": false,
            "affected_by_vulnerabilities": [],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:ebuild/www-client/firefox-bin@88.0"
        }
    ],
    "affected_packages": [
        {
            "url": "http://public2.vulnerablecode.io/api/packages/2444?format=api",
            "purl": "pkg:alpm/archlinux/firefox@86.0.1-1",
            "is_vulnerable": true,
            "affected_by_vulnerabilities": [
                {
                    "vulnerability": "VCID-7rjc-m97c-83bw"
                },
                {
                    "vulnerability": "VCID-bhjp-7njc-xbf3"
                },
                {
                    "vulnerability": "VCID-dvbc-un9c-dka7"
                },
                {
                    "vulnerability": "VCID-jf4p-n5ew-v3an"
                },
                {
                    "vulnerability": "VCID-mnc8-vfr4-s7a2"
                },
                {
                    "vulnerability": "VCID-t42j-3sa7-dbdz"
                },
                {
                    "vulnerability": "VCID-uqnd-w9j9-9yh7"
                },
                {
                    "vulnerability": "VCID-wqx2-shku-xuft"
                }
            ],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:alpm/archlinux/firefox@86.0.1-1"
        }
    ],
    "references": [
        {
            "reference_url": "https://api.first.org/data/v1/epss?cve=CVE-2021-23986",
            "reference_id": "",
            "reference_type": "",
            "scores": [
                {
                    "value": "0.00087",
                    "scoring_system": "epss",
                    "scoring_elements": "0.24914",
                    "published_at": "2026-06-04T12:55:00Z"
                }
            ],
            "url": "https://api.first.org/data/v1/epss?cve=CVE-2021-23986"
        },
        {
            "reference_url": "https://security.archlinux.org/AVG-1728",
            "reference_id": "AVG-1728",
            "reference_type": "",
            "scores": [
                {
                    "value": "High",
                    "scoring_system": "archlinux",
                    "scoring_elements": ""
                }
            ],
            "url": "https://security.archlinux.org/AVG-1728"
        },
        {
            "reference_url": "https://security.gentoo.org/glsa/202104-10",
            "reference_id": "GLSA-202104-10",
            "reference_type": "",
            "scores": [],
            "url": "https://security.gentoo.org/glsa/202104-10"
        },
        {
            "reference_url": "https://www.mozilla.org/en-US/security/advisories/mfsa2021-10",
            "reference_id": "mfsa2021-10",
            "reference_type": "",
            "scores": [
                {
                    "value": "high",
                    "scoring_system": "generic_textual",
                    "scoring_elements": ""
                }
            ],
            "url": "https://www.mozilla.org/en-US/security/advisories/mfsa2021-10"
        }
    ],
    "weaknesses": [],
    "exploits": [],
    "severity_range_score": "7.0 - 8.9",
    "exploitability": "0.5",
    "weighted_severity": "8.0",
    "risk_score": 4.0,
    "resource_url": "http://public2.vulnerablecode.io/vulnerabilities/VCID-jf4p-n5ew-v3an"
}