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.
Does this matter?
Lower severity and a low EPSS score (3.26%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 2.0
- 6.8 MEDIUMAV:N/AC:M/Au:N/C:P/I:P/A:P
- EPSS
- 3.26% probability · 88th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-264
- Affected
- mozilla/firefox
- Source
- cve@mitre.org
EPSS 3.3% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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.htmlVendor Advisory
- 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.htmlVendor Advisory
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.