CVE-2015-4516
Mozilla: JavaScript immutable property enforcement can be bypassed (MFSA 2015-109)
Severity
ImportantRed Hat Product Security
CVSS 2.0
Review impact separately from score.
Published · September 22, 2015
Updated · November 21, 2025
Description
Mozilla Firefox before 41.0 allows remote attackers to bypass certain ECMAScript 5 (aka ES5) API protection mechanisms and modify immutable properties, and consequently execute arbitrary JavaScript code with chrome privileges, via a crafted web page that does not use ES5 APIs.
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 2.0 · 6.8AV:N/AC:M/Au:N/C:P/I:P/A:P
CWE-250 · Execution with Unnecessary Privileges