CVE-2019-9801

MediumCVSS 5.3/10Last modified Jun 17, 2026

Description

Firefox will accept any registered Program ID as an external protocol handler and offer to launch this local application when given a matching URL on Windows operating systems. This should only happen if the program has specifically registered itself as a "URL Handler" in the Windows registry. *Note: This issue only affects Windows operating systems. Other operating systems are unaffected.*. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.

Metrics

CVSS 3.0 5.3/10CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Weakness enumeration

CWE-20

Affected software

No affected versions have been published.

Timeline

Published: Apr 26, 2019
Last modified: Jun 17, 2026
NVD status: Modified

Related CVEs from 2019

CVE-2019-98027.5If a Sandbox content process is compromised, it can initiate an FTP download which will then use a child process to render the downloaded da CVE-2019-98037.4The Upgrade-Insecure-Requests (UIR) specification states that if UIR is enabled through Content Security Policy (CSP), navigation to a same-CVE-2019-98049.8In Firefox Developer Tools it is possible that pasting the result of the 'Copy as cURL' command into a command shell on macOS will cause the CVE-2019-98059.8A latent vulnerability exists in the Prio library where data may be read from uninitialized memory for some functions, leading to potential CVE-2019-98067.5A vulnerability exists during authorization prompting for FTP transaction where successive modal prompts are displayed and cannot be immedia CVE-2019-98074.3When arbitrary text is sent over an FTP connection and a page reload is initiated, it is possible to create a modal alert message with this CVE-2019-98085.3If WebRTC permission is requested from documents with data: or blob: URLs, the permission notifications do not properly display the originat CVE-2019-98097.5If the source for resources on a page is through an FTP connection, it is possible to trigger a series of modal alert messages for these res CVE-2019-98108.8Incorrect alias information in IonMonkey JIT compiler for Array.prototype.slice method may lead to missing bounds check and a buffer overflo CVE-2019-98118.3As part of a winning Pwn2Own entry, a researcher demonstrated a sandbox escape by installing a malicious language pack and then opening a br CVE-2019-98129.3Given a compromised sandboxed content process due to a separate vulnerability, it is possible to escape that sandbox by loading accounts.fir CVE-2019-98138.8Incorrect handling of __proto__ mutations may lead to type confusion in IonMonkey JIT code and can be leveraged for arbitrary memory read an