Zero-day Vulnerability Database

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Zero-day vulnerabilities discovered: 1

Phishing attack in Opera browser
CVE-2012-6467

Improper input validation

The vulnerability allows a remote attacker to perform phishing attacks.
 
The vulnerability exists due to improper input validation when processing Internet shortcuts, referenced by IMG or other inline elements. A remote attacker can create a specially crafted web page, trick the victim into visiting it and perform a phishing attack.

Note: the vulnerability was being actively exploited.

Software: Opera

Links:

http://www.opera.com/docs/changelogs/unified/1210/
http://www.opera.com/security/advisory/1034

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About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.