CVE-2012-0458

CVE-2012-0458 is a medium-severity vulnerability in Mozilla Firefox with a CVSS 2.0 base score of 6.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-264.

Key facts

• Severity: Medium (CVSS 2.0 base score 6.8)
• EPSS exploit prediction: 3% (85th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-264
• Affected product: Mozilla Firefox
• Published: 2012-03-14
• Last modified: 2026-06-16

Description

Mozilla Firefox before 3.6.28 and 4.x through 10.0, Firefox ESR 10.x before 10.0.3, Thunderbird before 3.1.20 and 5.0 through 10.0, Thunderbird ESR 10.x before 10.0.3, and SeaMonkey before 2.8 do not properly restrict setting the home page through the dragging of a URL to the home button, which allows user-assisted remote attackers to execute arbitrary JavaScript code with chrome privileges via a javascript: URL that is later interpreted in the about:sessionrestore context.

Frequently asked questions

What is CVE-2012-0458?

Mozilla Firefox before 3.6.28 and 4.x through 10.0, Firefox ESR 10.x before 10.0.3, Thunderbird before 3.1.20 and 5.0 through 10.0, Thunderbird ESR 10.x before 10.0.3, and SeaMonkey before 2.8 do not properly restrict setting the home page through the dragging of a URL to the home button, which allows user-assisted remote attackers to execute arbitrary JavaScript code with chrome privileges via a javascript: URL that is later interpreted in the about:sessionrestore context.

How severe is CVE-2012-0458?

CVE-2012-0458 has a CVSS 2.0 base score of 6.8, rated medium severity.

Is CVE-2012-0458 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2012-0458?

CVE-2012-0458 primarily affects Mozilla Firefox. In total, 112 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2012-0458?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2012-0458 published?

CVE-2012-0458 was published on 2012-03-14 and last updated on 2026-06-16.

References

• http://lists.opensuse.org/opensuse-security-announce/2012-03/msg00014.html
• http://lists.opensuse.org/opensuse-security-announce/2012-03/msg00015.html
• http://lists.opensuse.org/opensuse-updates/2012-03/msg00042.html
• http://rhn.redhat.com/errata/RHSA-2012-0387.html
• http://rhn.redhat.com/errata/RHSA-2012-0388.html
• http://secunia.com/advisories/48359
• http://secunia.com/advisories/48402
• http://secunia.com/advisories/48414
• http://secunia.com/advisories/48495
• http://secunia.com/advisories/48496
• http://secunia.com/advisories/48513
• http://secunia.com/advisories/48553
• http://secunia.com/advisories/48561
• http://secunia.com/advisories/48624
• http://secunia.com/advisories/48629
• http://secunia.com/advisories/48823
• http://secunia.com/advisories/48920
• http://www.debian.org/security/2012/dsa-2433
• http://www.debian.org/security/2012/dsa-2458
• http://www.mandriva.com/security/advisories?name=MDVSA-2012:031
• http://www.mandriva.com/security/advisories?name=MDVSA-2012:032
• http://www.mozilla.org/security/announce/2012/mfsa2012-16.html
• http://www.securityfocus.com/bid/52460
• http://www.securitytracker.com/id?1026801
• http://www.securitytracker.com/id?1026803
• http://www.securitytracker.com/id?1026804
• http://www.ubuntu.com/usn/USN-1400-1
• http://www.ubuntu.com/usn/USN-1400-2
• http://www.ubuntu.com/usn/USN-1400-3
• http://www.ubuntu.com/usn/USN-1400-4

Affected products (112)

• cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:10.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:10.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:10.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:thunderbird_esr:10.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:thunderbird_esr:10.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:thunderbird_esr:10.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:-:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.0:alpha:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.0:beta:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.0.3:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.0.4:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.0.5:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.0.6:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.0.7:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.0.8:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.0.9:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1:alpha:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1:beta:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.1:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.2:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.3:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.4:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.5:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.6:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.7:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.8:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.9:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.10:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.11:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.12:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.13:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.14:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.15:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.16:*:*:*:*:*:*:*

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