Opera » Opera Browser : Security Vulnerabilities, CVEs, CVSS score between 5 and 6.99
The HTTP/2 protocol does not consider the role of the TCP congestion window in providing information about content length, which makes it easier for remote attackers to obtain cleartext data by leveraging a web-browser configuration in which third-party cookies are sent, aka a "HEIST" attack.
Max CVSS
5.3
EPSS Score
0.51%
Published
2016-09-06
Updated
2017-02-19
Characters from languages are such as Arabic, Hebrew are displayed from RTL (Right To Left) order in Opera 37.0.2192.105088 for Android, due to mishandling of several unicode characters such as U+FE70, U+0622, U+0623 etc and how they are rendered combined with (first strong character) such as an IP address or alphabet could lead to a spoofed URL. It was noticed that by placing neutral characters such as "/", "?" in filepath causes the URL to be flipped and displayed from Right To Left. However, in order for the URL to be spoofed the URL must begin with an IP address followed by neutral characters as omnibox considers IP address to be combination of punctuation and numbers and since LTR (Left To Right) direction is not properly enforced, this causes the entire URL to be treated and rendered from RTL (Right To Left). However, it doesn't have be an IP address, what matters is that first strong character (generally, alphabetic character) in the URL must be an RTL character.
Max CVSS
6.1
EPSS Score
0.07%
Published
2017-01-26
Updated
2017-01-27
Opera Mini 13 and Opera Stable 36 allow remote attackers to spoof the displayed URL via a crafted HTML document, related to the about:blank URL.
Max CVSS
6.1
EPSS Score
0.16%
Published
2017-04-21
Updated
2022-04-06
Opera before 12.15 does not properly block top-level domains in Set-Cookie headers, which allows remote attackers to obtain sensitive information by leveraging control of a different web site in the same top-level domain.
Max CVSS
5.0
EPSS Score
0.14%
Published
2013-04-19
Updated
2013-04-22
Opera before 12.13 does not send CORS preflight requests in all required cases, which allows remote attackers to bypass a CSRF protection mechanism via a crafted web site that triggers a CORS request.
Max CVSS
6.8
EPSS Score
0.16%
Published
2013-02-08
Updated
2013-03-08
Opera before 12.12 allows remote attackers to spoof the address field via a high rate of HTTP requests.
Max CVSS
5.0
EPSS Score
0.14%
Published
2013-01-02
Updated
2013-01-02
Opera before 12.11 allows remote attackers to determine the existence of arbitrary local files via vectors involving web script in an error page.
Max CVSS
5.0
EPSS Score
0.31%
Published
2013-01-02
Updated
2015-10-08
Opera before 12.10 does not properly handle incorrect size data in a WebP image, which allows remote attackers to obtain potentially sensitive information from process memory by using a crafted image as the fill pattern for a canvas.
Max CVSS
5.0
EPSS Score
0.14%
Published
2013-01-02
Updated
2013-01-02
Opera before 12.10 does not properly implement the Cross-Origin Resource Sharing (CORS) specification, which allows remote attackers to bypass intended page-content restrictions via a crafted request.
Max CVSS
5.0
EPSS Score
0.11%
Published
2013-01-02
Updated
2013-01-02
The X.509 certificate-validation functionality in the https implementation in Opera before 12.10 allows remote attackers to trigger a false indication of successful revocation-status checking by causing a failure of a single checking service.
Max CVSS
5.0
EPSS Score
0.14%
Published
2013-01-02
Updated
2013-01-02
Opera before 11.67 and 12.x before 12.02 allows remote attackers to cause truncation of a dialog, and possibly trigger downloading and execution of arbitrary programs, via a crafted web site.
Max CVSS
5.0
EPSS Score
0.17%
Published
2013-01-02
Updated
2013-01-02
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.
Max CVSS
6.8
EPSS Score
0.75%
Published
2012-08-06
Updated
2012-08-07
Opera before 11.60 allows remote attackers to spoof the address bar via unspecified homograph characters, a different vulnerability than CVE-2010-2660.
Max CVSS
5.0
EPSS Score
0.20%
Published
2012-08-30
Updated
2012-09-13
Opera before 12.00 Beta allows remote attackers to cause a denial of service (application crash) via crafted WebGL content, as demonstrated by a codeflow.org WebGL demo.
Max CVSS
5.0
EPSS Score
0.26%
Published
2012-06-14
Updated
2017-08-29
Opera before 12.00 Beta allows remote attackers to cause a denial of service (memory consumption or application hang) via an IFRAME element that uses the src="#" syntax to embed a parent document.
Max CVSS
5.0
EPSS Score
0.26%
Published
2012-06-14
Updated
2017-08-29
Opera before 12.00 Beta allows remote attackers to cause a denial of service (application crash) via crafted characters in domain names, as demonstrated by "IDNA2008 tests."
Max CVSS
5.0
EPSS Score
0.26%
Published
2012-06-14
Updated
2017-08-29
Opera before 12.00 Beta allows remote attackers to cause a denial of service (application hang) via an absolutely positioned wrap=off TEXTAREA element located next to an "overflow: auto" block element.
Max CVSS
5.0
EPSS Score
0.26%
Published
2012-06-14
Updated
2017-08-29
Opera before 12.00 Beta allows remote attackers to cause a denial of service (application crash) via a web page that contains invalid character encodings.
Max CVSS
5.0
EPSS Score
0.24%
Published
2012-06-14
Updated
2017-08-29
Opera before 11.65 does not properly restrict the reading of JSON strings, which allows remote attackers to perform cross-domain loading of JSON resources and consequently obtain sensitive information via a crafted web site.
Max CVSS
5.0
EPSS Score
0.19%
Published
2012-06-14
Updated
2012-06-15
Opera before 11.62 on Mac OS X allows remote attackers to spoof the address field and security dialogs via crafted styling that causes page content to be displayed outside of the intended content area.
Max CVSS
6.4
EPSS Score
1.75%
Published
2012-03-28
Updated
2018-01-05
Opera before 11.62 allows remote attackers to spoof the address field by triggering a page reload followed by a redirect to a different domain.
Max CVSS
6.4
EPSS Score
1.84%
Published
2012-03-28
Updated
2018-01-06
Opera before 11.62 allows remote attackers to spoof the address field by triggering the launch of a dialog window associated with a different domain.
Max CVSS
6.4
EPSS Score
1.84%
Published
2012-03-28
Updated
2018-01-06
Opera before 11.62 allows remote attackers to bypass the Same Origin Policy via the (1) history.pushState and (2) history.replaceState functions in conjunction with cross-domain frames, leading to unintended read access to history.state information.
Max CVSS
5.0
EPSS Score
0.87%
Published
2012-03-28
Updated
2018-01-06
Opera before 11.62 does not ensure that a dialog window is placed on top of content windows, which makes it easier for user-assisted remote attackers to trick users into downloading and executing arbitrary files via a download dialog located under other windows.
Max CVSS
6.8
EPSS Score
1.62%
Published
2012-03-28
Updated
2018-01-05
Opera before 11.62 allows user-assisted remote attackers to trick users into downloading and executing arbitrary files via a small window for the download dialog.
Max CVSS
6.8
EPSS Score
1.62%
Published
2012-03-28
Updated
2018-01-05