CVE-2012-4144: n/a vulnerability

CVE-2012-4144: Opera before 12.01 on Windows and UNIX, and before 11.66 and 12.x before 12.01 on Mac OS X, does not proper...

Opera before 12.01 on Windows and UNIX, and before 11.66 and 12.x before 12.01 on Mac OS X, does not properly escape characters in DOM elements, which makes it easier for remote attackers to bypass cross-site scripting (XSS) protection mechanisms via a crafted HTML document.

UnknownCVSS not scoredNot KEV-listedUpdatedSep 16, 2024, 16:27 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2012-4144 is an old Opera browser issue where crafted web content could make Opera’s XSS protections easier to bypass. The practical concern is users opening malicious or compromised pages in affected legacy Opera versions, not a server-side flaw in an organization’s own application. Likely exposure is limited to endpoints still running the named legacy Opera versions. Modern Opera installations are not identified as affected in the provided sources. Organizations with unmanaged desktops, old kiosks, archived virtual machines, or legacy test environments should verify browser versions. Prioritize this as legacy endpoint risk rather than an emergency enterprise-wide incident. If affected Opera versions are still present, remediate promptly because browser flaws can be triggered by normal web browsing. If legacy Opera is absent, residual business risk is low. Mitigation focus: Upgrade affected Opera installations to the vendor-fixed versions named in the changelogs.; Retire unsupported legacy Opera versions where upgrades are not practical.; Check current vendor guidance if legacy Opera must remain in use..

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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