{"id":"CVE-2012-4142","aliases":["EUVD-2012-4086","GHSA-55h8-9r93-gr3v"],"status":"published","title":"Opera before 12.01 on Windows and UNIX, and before 11.66 and 12.x before 12.01 on Mac OS X,...","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.","severity":{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.01161,"percentile":0.67371,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2012-08-06T16:00:00Z","modified":"2026-06-16T23:44:27Z","products":[{"vendor":"opera","product":"opera_browser"}],"references":[{"url":"http://www.opera.com/docs/changelogs/mac/1166/","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"http://www.opera.com/docs/changelogs/windows/1201/","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"http://www.opera.com/support/kb/view/1026/","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory"]},{"url":"http://www.opera.com/docs/changelogs/mac/1201/","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"http://www.opera.com/docs/changelogs/unix/1201/","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2012-4142"},{"url":"http://www.opera.com/docs/changelogs/mac/1166"},{"url":"http://www.opera.com/docs/changelogs/mac/1201"},{"url":"http://www.opera.com/docs/changelogs/unix/1201"},{"url":"http://www.opera.com/docs/changelogs/windows/1201"},{"url":"http://www.opera.com/support/kb/view/1026"},{"url":"https://github.com/advisories/GHSA-55h8-9r93-gr3v"}],"sources":{"cve":[{"id":"CVE-2012-4142","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.","status":"published","published":"2012-08-06T16:00:00Z","modified":"2024-09-16T21:07:19.255Z","updated_at":"2026-11-02T14:34:51.584538Z"}],"euvd":[{"id":"EUVD-2012-4086","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.","status":"published","published":"2012-08-06T16:00:00Z","modified":"2024-09-16T21:07:19Z","updated_at":"2026-11-03T00:55:08.067702Z"}],"ghsa":[{"id":"GHSA-55h8-9r93-gr3v","title":"Opera before 12.01 on Windows and UNIX, and before 11.66 and 12.x before 12.01 on Mac OS X,...","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.","status":"published","published":"2022-05-17T05:26:50Z","modified":"2025-04-11T04:01:17Z","cwes":["CWE-79"],"updated_at":"2026-11-02T15:01:11.561612Z"}],"nvd":[{"id":"CVE-2012-4142","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.","status":"published","published":"2012-08-06T16:55:06.977Z","modified":"2026-06-16T23:44:27.91Z","cvss":[{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:02:15.188652Z"}]}}