CVE-2012-4203
The New Tab page in Mozilla Firefox before 17.0 uses a privileged context for execution of...
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.
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2012-4203- CVSS 2.0
- 6.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:P - Weakness
- CWE-264
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2012-4203- Updated
- 2026-11-02
EUVDEUVD-2012-4147 No score
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.
- Record
EUVD-2012-4147- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-rfmr-q5xq-hg6g No score
The New Tab page in Mozilla Firefox before 17.0 uses a privileged context for execution of...
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.
- Record
GHSA-rfmr-q5xq-hg6g- Updated
- 2026-11-02
OSVopenSUSE-SU-2024:10071-1 No score
MozillaFirefox-50.1.0-1.1 on GA media
These are all security issues fixed in the MozillaFirefox-50.1.0-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:10071-1- Updated
- 2026-11-02
OSVopenSUSE-SU-2024:14572-1 No score
firefox-esr-128.5.1-1.1 on GA media
These are all security issues fixed in the firefox-esr-128.5.1-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:14572-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
MozillaFirefoxopenSUSE:Tumbleweed |
before 50.1.0-1.1 | 50.1.0-1.1 |
firefox-esropenSUSE:Tumbleweed |
before 128.5.1-1.1 | 128.5.1-1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2012-4203 is a medium vulnerability (CVSS 6.8) in Mozilla Firefox, published November 21, 2012. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.26%, the 88th percentile. Fixed in MozillaFirefox 50.1.0-1.1.
References
bugzilla.mozilla.org/show_bug.cgi?id=765628
ubuntu.com/usn/USN-1638-3
lists.opensuse.org/opensuse-updates/2012-11/msg00093.html
secunia.com/advisories/51434
Show 194 moreShow less
securityfocus.com/bid/56623
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16503
mozilla.org/security/announce/2012/mfsa2012-95.html
nvd.nist.gov/vuln/detail/CVE-2012-4203
github.com/advisories/GHSA-rfmr-q5xq-hg6g
suse.com/security/cve/CVE-2008-5913
Left out here: 1,871 references. The JSON record has them.