CVE-2012-1251: Opera before 9.63 does not properly verify X.509 certificates from SSL servers, which allows man-in-the-mid...

Security readout for executives and security teams

Older Opera browsers before version 9.63 may trust invalid or crafted SSL certificates. An attacker positioned between a user and a website could impersonate that site and capture sensitive information. This mainly matters where very old Opera installations still exist. Exposure is limited to systems still running Opera versions before 9.63. Modern environments are unlikely to be affected unless legacy desktop images, kiosks, embedded browsers, or archived virtual machines still use old Opera builds. Treat this as a legacy exposure cleanup item. It is serious if affected browsers are still used for sensitive sites, but current urgency depends entirely on whether pre-9.63 Opera exists in the environment. Mitigation focus: Upgrade Opera installations to version 9.63 or later where still present.; Retire unsupported Opera versions from managed endpoints and kiosk images.; Check vendor changelogs and advisories for platform-specific guidance..

Prepared

Jun 24, 2026, 12:34 UTC (UTC+00:00)

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