CVE-2012-4142: n/a vulnerability

CVE-2012-4142: Opera before 12.01 on Windows and UNIX, and before 11.66 and 12.x before 12.01 on Mac OS X, ignores some ch...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedSep 16, 2024, 21:07 UTC (UTC+00:00)

Security readout for executives and security teams

This is an old Opera browser issue where certain HTML characters could be ignored, making cross-site scripting easier if a user opened a crafted HTML document. The source bundle does not provide a CVSS score, known exploitation evidence, or detailed impact beyond XSS enablement. Exposure is mainly legacy endpoints still running the affected Opera browser versions. Modern environments are unlikely to be exposed unless old browser builds remain installed, embedded, or used for compatibility testing. Treat this as a legacy browser hygiene issue unless affected Opera versions are still present. Business urgency is low for modern fleets, but any confirmed legacy browser use should be remediated because browser XSS issues can support phishing and web-based compromise. Mitigation focus: Inventory endpoints for legacy Opera versions listed as affected.; Upgrade affected Windows and UNIX installations to Opera 12.01 or later.; Upgrade affected Mac installations to Opera 11.66 or 12.01 or later, as applicable..

Prepared: Jun 27, 2026, 17:28 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Aug 6, 2012, 16:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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1Source links

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Source materials

CVE List V5 sourceCVE List V5

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

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