CVE-2023-25729
Mozilla: Extensions could have opened external schemes without user knowledge
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · February 14, 2023
Updated · November 21, 2025
Description
The Mozilla Foundation Security Advisory describes this flaw as:
Permission prompts for opening external schemes were only shown for ContentPrincipals resulting in extensions being able to open them without user interaction via ExpandedPrincipals. This could lead to further malicious actions such as downloading files or interacting with software already installed on the system.
Statement
Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 8.8CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-84 · Improper Neutralization of Encoded URI Schemes in a Web Page