CVE-2015-4495VulnerabilityPublished 05/25/2022Updated 10/24/2026

CVE-2015-4495: Mozilla Firefox Security Feature Bypass Vulnerability

Affects Mozilla FirefoxSource CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 05/25/2022
KEV deadline: 06/15/2022
EPSS: 68.6% chance of exploitation in 30 days – higher than 99% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2015-4495 (opens in a new tab)

Description

CVE-2015-4495 is a security feature bypass vulnerability in Mozilla Firefox that allows remote attackers to bypass the Same Origin Policy, potentially enabling them to read arbitrary files or escalate privileges.

Summary

This vulnerability in Mozilla Firefox enables remote attackers to bypass the Same Origin Policy, a critical security mechanism designed to restrict how documents or scripts loaded from one origin can interact with resources from another origin. Exploitation of this flaw can lead to unauthorized reading of arbitrary files or gaining elevated privileges within the browser context. The vulnerability has been exploited in the wild, indicating active use by attackers.

Impact

Successful exploitation allows remote attackers to bypass the Same Origin Policy, which can lead to unauthorized access to sensitive information or privilege escalation within the browser environment. This undermines the browser's security model and can facilitate further attacks.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.

Weaknesses

CWE-200Information Exposure (opens in a new tab)

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 11:49:56 UTC

Weaknesses

References

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