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CVSS: 6.5EPSS: 0%CPEs: 4EXPL: 0

Microsoft introduced a new feature in Windows 10 known as Cloud Clipboard which, if enabled, will record data copied to the clipboard to the cloud, and make it available on other computers in certain scenarios. Applications that wish to prevent copied data from being recorded in Cloud History must use specific clipboard formats; and Firefox before versions 94 and ESR 91.3 did not implement them. This could have caused sensitive data to be recorded to a user's Microsoft account. *This bug only affects Firefox for Windows 10+ with Cloud Clipboard enabled. Other operating systems are unaffected.*. • https://bugzilla.mozilla.org/show_bug.cgi?id=1730194 https://www.mozilla.org/security/advisories/mfsa2021-48 https://www.mozilla.org/security/advisories/mfsa2021-49 https://www.mozilla.org/security/advisories/mfsa2021-50 • CWE-668: Exposure of Resource to Wrong Sphere •

CVSS: 8.8EPSS: 0%CPEs: 4EXPL: 0

The executable file warning was not presented when downloading .inetloc files, which, due to a flaw in Mac OS, can run commands on a user's computer.*Note: This issue only affected Mac OS operating systems. Other operating systems are unaffected.*. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3. La advertencia de archivo ejecutable no se presentaba cuando se descargaban archivos .inetloc, que, debido a un fallo en Mac OS, pueden ejecutar comandos en el ordenador de un usuario. • https://bugzilla.mozilla.org/show_bug.cgi?id=1731779 https://www.mozilla.org/security/advisories/mfsa2021-48 https://www.mozilla.org/security/advisories/mfsa2021-49 https://www.mozilla.org/security/advisories/mfsa2021-50 •

CVSS: 6.1EPSS: 0%CPEs: 2EXPL: 1

A Universal XSS vulnerability was present in Firefox for Android resulting from improper sanitization when processing a URL scanned from a QR code. *This bug only affects Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 94. Una vulnerabilidad de tipo XSS universal estaba presente en Firefox para Android como resultado de un saneo inapropiado cuando se procesa una URL escaneada desde un código QR. • https://github.com/hfh86/CVE-2021-43530-UXSS-On-QRcode-Reader- https://bugzilla.mozilla.org/show_bug.cgi?id=1736886 https://www.mozilla.org/security/advisories/mfsa2021-48 • CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') •

CVSS: 4.3EPSS: 0%CPEs: 1EXPL: 0

When a user loaded a Web Extensions context menu, the Web Extension could access the post-redirect URL of the element clicked. If the Web Extension lacked the WebRequest permission for the hosts involved in the redirect, this would be a same-origin-violation leaking data the Web Extension should have access to. This was fixed to provide the pre-redirect URL. This is related to CVE-2021-43532 but in the context of Web Extensions. This vulnerability affects Firefox < 94. • https://bugzilla.mozilla.org/show_bug.cgi?id=1659155 https://www.mozilla.org/security/advisories/mfsa2021-48 • CWE-346: Origin Validation Error •

CVSS: 6.1EPSS: 0%CPEs: 1EXPL: 0

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. • https://bugzilla.mozilla.org/show_bug.cgi?id=1719203 https://www.mozilla.org/security/advisories/mfsa2021-48 • CWE-601: URL Redirection to Untrusted Site ('Open Redirect') •