CVE-2017-7831: A vulnerability where the security wrapper does not deny access to some exposed properties using the deprec...

Security readout for executives and security teams

CVE-2017-7831 is an old Firefox security-wrapper flaw affecting versions before Firefox 57. The issue involved proxy objects being allowed access to properties that should have been blocked. The provided sources do not give a CVSS score, impact details, or evidence of active exploitation. Exposure is limited to environments still running Firefox versions earlier than 57. This is most plausible on unmanaged legacy endpoints, old virtual desktop images, kiosks, or archived systems not covered by normal browser patching. Treat this as a legacy hygiene issue unless Firefox before 57 is still present. Urgency rises if outdated Firefox is used to browse untrusted sites or remains in shared images used across the business. Mitigation focus: Upgrade Firefox installations to version 57 or later, preferably a current supported release.; Remove unsupported Firefox builds from managed endpoints and base images.; Check Mozilla guidance for any additional vendor-specific remediation notes..

Prepared

Jun 7, 2026, 06:44 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.