CVE-2012-4142

Severity: medium (CVSS 4.3 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2012-08-06 · updated 2026-06-16
Weakness: CWE-79

Description

Opera before 12.01 on Windows and UNIX, and before 11.66 and 12.x before 12.01 on Mac OS X, ignores some characters in HTML documents in unspecified circumstances, which makes it easier for remote attackers to conduct cross-site scripting (XSS) attacks via a crafted document.

Affected products

Opera Browser: through 12.00; through 11.65; 12.00-beta, 10.00, 10.00-beta1, 10.00-beta2, 10.00-beta3, 10.01 (+36)

References

http://www.opera.com/docs/changelogs/mac/1166/
http://www.opera.com/docs/changelogs/mac/1201/
http://www.opera.com/docs/changelogs/unix/1201/
http://www.opera.com/docs/changelogs/windows/1201/
http://www.opera.com/support/kb/view/1026/
http://www.opera.com/docs/changelogs/mac/1166/
http://www.opera.com/docs/changelogs/mac/1201/
http://www.opera.com/docs/changelogs/unix/1201/
http://www.opera.com/docs/changelogs/windows/1201/
http://www.opera.com/support/kb/view/1026/

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