CVE-2012-5851

html/parser/XSSAuditor.cpp in WebCore in WebKit, as used in Google Chrome through 22 and Safari 5...

4.3 MediumPublic exploit

html/parser/XSSAuditor.cpp in WebCore in WebKit, as used in Google Chrome through 22 and Safari 5.1.7, does not consider all possible output contexts of reflected data, which makes it easier for remote attackers to bypass a cross-site scripting (XSS) protection mechanism via a crafted string, aka rdar problem 12019108.

Exploit likelihood

2.28%Up 0.3 points since Feb 4, 2022

What each source reports

NVD Score used 4.3

Record: CVE-2012-5851
CVSS 2.0: 4.3 MediumAV:N/AC:M/Au:N/C:N/I:P/A:N
Weakness: CWE-79
Updated: 2026-11-02

CVE List No score

Record: CVE-2012-5851
Updated: 2026-11-02

EUVDEUVD-2012-5729 No score

Record: EUVD-2012-5729
Updated: 2026-11-03

GitHub AdvisoriesGHSA-xqrw-qq76-h9pm No score

html/parser/XSSAuditor.cpp in WebCore in WebKit, as used in Google Chrome through 22 and Safari 5...

Record: GHSA-xqrw-qq76-h9pm
Weakness: CWE-79
Updated: 2026-11-02

OSVUBUNTU-CVE-2012-5851 No score

Record: UBUNTU-CVE-2012-5851
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`qtwebkit-source` Ubuntu:16.04:LTS	All versions, plus listed versions 2.3.2-0ubuntu102.3.2-0ubuntu11	None known

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
Exploit-DB	WebKit Cross-Site Scripting Filter - 'Cross-Site ScriptingAuditor.cpp' Security Bypass	2012-07-19

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, Exploit-DB, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2012-5851 is a medium vulnerability (CVSS 4.3) in Apple Safari, published November 15, 2012. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 2.28%, the 83rd percentile. No source names a fixed version.