Design/Logic Flaw

Unspecified vulnerability in Opera before 12.01 on Windows and UNIX, and before 11.66 and 12.x before 12.01 on Mac OS X, has unknown impact and attack vectors, related to a "low severity issue."...

Cross site scripting

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...

Design/Logic Flaw

Opera before 12.01 on Windows and UNIX, and before 11.66 and 12.x before 12.01 on Mac OS X, allows user-assisted remote attackers to trick users into downloading and executing arbitrary files via a small window for the download dialog, a different vulnerability than CVE-2012-1924...

Cross site scripting

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...

CVE-2012-4143

Opera < 12.01 on Windows/UNIX and = 12.01.1532) as remediation. No explicit root cause details are provided beyond the dialog-based delivery vector in the sources.

CVE-2012-4143

Opera before 12.01 on Windows and UNIX, and before 11.66 and 12.x before 12.01 on Mac OS X, allows user-assisted remote attackers to trick users into downloading and executing arbitrary files via a small window for the download dialog, a different vulnerability than CVE-2012-1924...

CVE-2012-4146

Opera is affected by CVE-2012-4146 (and related 2012-41xx CVEs) on multiple platforms. The issue allows a remote attacker to cause an application crash (DoS) by visiting a crafted web page, as demonstrated by the Lenovo “Shop now” page. The vulnerability affects Opera before 12.01, with the Mac O...

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 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...

CVE-2012-4142

Opera’s CVE-2012-4142 affects multiple platforms: Windows/UNIX builds before 12.01 and Mac OS X builds before 11.66 (and before 12.01 for 12.x lines). The flaw arises from Opera’s HTML parsing, which ignores some characters under unspecified circumstances, enabling remote XSS via crafted document...

CVE-2012-4145

Opera CVE-2012-4145 concerns multiple vulnerabilities in Opera prior to 12.01 on Windows and UNIX, and prior to 11.66 and 12.x prior to 12.01 on macOS. Public records from OpenVAS, Red Hat SCM, Gentoo GLSA, and Gentoo Nessus entries describe the issue as high-severity with CVSS base score 10.0 (A...

CVE-2012-4144

Opera is vulnerable to cross-site scripting due to improper escaping in DOM elements. The affected versions are Opera on Windows/UNIX older than 12.01 and on Mac OS X older than 11.66, with 12.x prior to 12.01 also affected. Root cause: failure to escape characters in DOM elements within crafted ...

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 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...

CVE-2012-4146

Opera before 12.01 allows remote attackers to cause a denial of service application crash via a crafted web site, as demonstrated by the Lenovo "Shop now" page...

CVE-2012-4145

Unspecified vulnerability in Opera before 12.01 on Windows and UNIX, and before 11.66 and 12.x before 12.01 on Mac OS X, has unknown impact and attack vectors, related to a "low severity issue."...

Opera < 12.01 Multiple Vulnerabilities

The version of Opera installed on the remote host is earlier than 12.01 and is, therefore, reportedly affected by multiple issues : - An error exists in the handling of certain URLs that can lead to memory corruption and possible code execution. 1016 - Errors exist in the handling of DOM elements...

Opera 12.01 Released With Fixes for Five Security Flaws

There are new versions of the Opera browser available, a small update to version 12.01, but they include a number of important security fixes, notably a patch for a vulnerability that could lead to remote code execution. The maintainers of Opera pushed out new versions for all of the major...

Element HTML content can be incorrectly returned without escaping, bypassing some HTML sanitizers

When sites accept HTML from untrusted users, and use that HTML as page content, they typically sanitize the untrusted HTML to ensure that it does not contain any harmful content, such as malicious scripts. In some cases, this sanitization may be performed by writing and reading the contents of DO...

Element HTML content can be incorrectly returned without escaping, bypassing some HTML sanitizers – Opera Security Advisories

When sites accept HTML from untrusted users, and use that HTML as page content, they typically sanitize the untrusted HTML to ensure that it does not contain any harmful content, such as malicious scripts. In some cases, this sanitization may be performed by writing and reading the contents of DO...

Certain URL constructs can allow arbitrary code execution

Certain page address URL constructs can cause Opera to allocate the wrong amount of memory for storing the address. When it then attempts to store the address, it will overwrite unrelated memory with attacker-controlled data. This can lead to a crash, which may also execute that data as code...

Small windows can be used in several ways to trick users into executing downloads

When the download dialog is displayed, it should always be visible to the user, to ensure that the user realizes it is there. If the dialog is displayed in a small enough window, the user may not realize it is being displayed, and if the right keyboard sequence is carefully followed, they can end...