CVE-2020-6810

MediumCVSS 4.3/10Last modified Jun 17, 2026

Description

After a website had entered fullscreen mode, it could have used a previously opened popup to obscure the notification that indicates the browser is in fullscreen mode. Combined with spoofing the browser chrome, this could have led to confusing the user about the current origin of the page and credential theft or other attacks. This vulnerability affects Firefox < 74.

Metrics

CVSS 3.1 4.3/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Weakness enumeration

CWE-290

Affected software

Vendor	Product	Versions
Mozilla	Firefox	>= unspecified, < 74

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1432856Issue Tracking, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-08/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1432856Issue Tracking, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-08/Vendor Advisory

Timeline

Published: Mar 25, 2020
Last modified: Jun 17, 2026
NVD status: Modified

Related CVEs from 2020

CVE-2020-68118.8The 'Copy as cURL' feature of Devtools' network tab did not properly escape the HTTP method of a request, which can be controlled by the web CVE-2020-68125.3The first time AirPods are connected to an iPhone, they become named after the user's name by default (e.g. Jane Doe's AirPods.) Websites wi CVE-2020-68135.3When protecting CSS blocks with the nonce feature of Content Security Policy, the @import statement in the CSS block could allow an attacker CVE-2020-68149.8Mozilla developers reported memory safety bugs present in Firefox and Thunderbird 68.5. Some of these bugs showed evidence of memory corrupt CVE-2020-68159.8Mozilla developers reported memory safety and script safety bugs present in Firefox 73. Some of these bugs showed evidence of memory corrupt CVE-2020-68166.1In Mozilla Bleach before 3.12, a mutation XSS in bleach.clean when RCDATA and either svg or math tags are whitelisted and the keyword argume CVE-2020-68177.5bleach.clean behavior parsing style attributes could result in a regular expression denial of service (ReDoS). Calls to bleach.clean with an CVE-2020-68198.1Under certain conditions, when running the nsDocShell destructor, a race condition can cause a use-after-free. We are aware of targeted atta CVE-2020-68208.1Under certain conditions, when handling a ReadableStream, a race condition can cause a use-after-free. We are aware of targeted attacks in t CVE-2020-68217.5When reading from areas partially or fully outside the source resource with WebGL's <code>copyTexSubImage</code> method, the specification r CVE-2020-68228.8On 32-bit builds, an out of bounds write could have occurred when processing an image larger than 4 GB in <code>GMPDecodeData</code>. It is CVE-2020-68239.8A malicious extension could have called <code>browser.identity.launchWebAuthFlow</code>, controlling the redirect_uri, and through the Promi