CVE-2021-43532

MediumCVSS 6.1/10Last modified Jun 17, 2026

Description

The 'Copy Image Link' context menu action would copy the final image URL after redirects. By embedding an image that triggered authentication flows - in conjunction with a Content Security Policy that stopped a redirection chain in the middle - the final image URL could be one that contained an authentication token used to takeover a user account. If a website tricked a user into copy and pasting the image link back to the page, the page would be able to steal the authentication tokens. This was fixed by making the action return the original URL, before any redirects. This vulnerability affects Firefox < 94.

Metrics

CVSS 3.1 6.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-601

Affected software

No affected versions have been published.

Timeline

Published: Dec 8, 2021
Last modified: Jun 17, 2026
NVD status: Modified

Related CVEs from 2021

CVE-2021-435334.3When parsing internationalized domain names, high bits of the characters in the URLs were sometimes stripped, resulting in inconsistencies t CVE-2021-435348.8Mozilla developers and community members reported memory safety bugs present in Firefox 93 and Firefox ESR 91.2. Some of these bugs showed e CVE-2021-435358.8A use-after-free could have occured when an HTTP2 session object was released on a different thread, leading to memory corruption and a pote CVE-2021-435366.5Under certain circumstances, asynchronous functions could have caused a navigation to fail but expose the target URL. This vulnerability aff CVE-2021-435378.8An incorrect type conversion of sizes from 64bit to 32bit integers allowed an attacker to corrupt memory leading to a potentially exploitabl CVE-2021-435384.3By misusing a race in our notification code, an attacker could have forcefully hidden the notification for pages that had received full scre CVE-2021-435398.8Failure to correctly record the location of live pointers across wasm instance calls resulted in a GC occurring within the call not tracing CVE-2021-43548.8The PWA for WP & AMP for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the pwaforwp_splashscreen_CVE-2021-435406.5WebExtensions with the correct permissions were able to create and install ServiceWorkers for third-party websites that would not have been CVE-2021-435416.5When invoking protocol handlers for external protocols, a supplied parameter URL containing spaces was not properly escaped. This vulnerabil CVE-2021-435426.5Using XMLHttpRequest, an attacker could have identified installed applications by probing error messages for loading external protocols. Thi CVE-2021-435436.1Documents loaded with the CSP sandbox directive could have escaped the sandbox's script restriction by embedding additional content. This vu