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    CVE-2012-4203

    The New Tab page in Mozilla Firefox before 17.0 uses a privileged context for execution of JavaScript code by bookmarklets, which allows user-assisted remote attackers to run arbitrary programs by leveraging a javascript: URL in a bookmark.

    Published:Nov 20, 2012
    Last Modified:Apr 11, 2025
    EPS:Nov 21, 2012
    EPSS Score:0.02473
    CVSS Score:6.8

    Affected Products

    Vendor
    Mozilla
    Product
    Firefox

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    CVE-2026-84139 (CVSS 6.1) — Clickjacking issue in the DOM: Events component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.…
    CVE-2026-84138 (CVSS 6.5) — Denial-of-service in the PDF Viewer component. This vulnerability was fixed in Firefox 155 and Thunderbird 155…
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    References

    http://lists.opensuse.org/opensuse-security-announce/2012-11/msg00021.html
    http://lists.opensuse.org/opensuse-security-announce/2013-01/msg00022.html
    http://lists.opensuse.org/opensuse-updates/2012-11/msg00090.html
    http://lists.opensuse.org/opensuse-updates/2012-11/msg00093.html
    http://secunia.com/advisories/51369
    http://secunia.com/advisories/51434
    http://secunia.com/advisories/51439
    http://www.mozilla.org/security/announce/2012/mfsa2012-95.html
    http://www.securityfocus.com/bid/56623
    http://www.ubuntu.com/usn/USN-1638-1
    http://www.ubuntu.com/usn/USN-1638-2
    http://www.ubuntu.com/usn/USN-1638-3
    https://bugzilla.mozilla.org/show_bug.cgi?id=765628
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16503
    http://lists.opensuse.org/opensuse-security-announce/2012-11/msg00021.html
    http://lists.opensuse.org/opensuse-security-announce/2013-01/msg00022.html
    http://lists.opensuse.org/opensuse-updates/2012-11/msg00090.html
    http://lists.opensuse.org/opensuse-updates/2012-11/msg00093.html
    http://secunia.com/advisories/51369
    http://secunia.com/advisories/51434
    http://secunia.com/advisories/51439
    http://www.mozilla.org/security/announce/2012/mfsa2012-95.html
    http://www.securityfocus.com/bid/56623
    http://www.ubuntu.com/usn/USN-1638-1
    http://www.ubuntu.com/usn/USN-1638-2
    http://www.ubuntu.com/usn/USN-1638-3
    https://bugzilla.mozilla.org/show_bug.cgi?id=765628
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16503

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High