CVE-2026-12295: Vulnerability in Mozilla Firefox
CVE-2026-12295 is a high-impact sandbox escape vulnerability in the DOM Navigation component of Mozilla Firefox. This vulnerability allows code running in a sandboxed environment to escape those restrictions, potentially leading to elevated privileges or unauthorized actions. The issue was fixed in Firefox 152, Firefox ESR 140.12, and Firefox ESR 115.37. Multiple related security vulnerabilities were addressed in these releases, including other sandbox escapes and memory safety bugs. No known exploits in the wild have been reported at this time.
AI Analysis
Technical Summary
CVE-2026-12295 is a sandbox escape vulnerability in the DOM Navigation component of Mozilla Firefox. It was reported by Yaqoub Aldurayhim and fixed in Firefox 152, Firefox ESR 140.12, and Firefox ESR 115.37. The vulnerability allows escaping the browser's sandbox protections, which could enable an attacker to perform actions beyond the intended security boundaries. This issue is part of a broader set of high-impact security fixes released simultaneously by Mozilla, addressing multiple sandbox escapes and memory safety bugs across Firefox and Thunderbird. The vendor advisories confirm the fix and classify the impact as high.
Potential Impact
The vulnerability enables sandbox escape in the DOM Navigation component, which can allow malicious code to break out of the browser's sandbox environment. This could lead to privilege escalation or unauthorized access to system resources. The impact is rated high by Mozilla. No exploits in the wild are currently known, but the potential for serious security breaches exists if the vulnerability is exploited.
Mitigation Recommendations
Mozilla has fixed this vulnerability in Firefox 152, Firefox ESR 140.12, and Firefox ESR 115.37. Users and administrators should update to these versions or later to remediate the issue. Since this is a client-side application vulnerability, applying the official updates is the primary and recommended mitigation. No additional vendor-recommended mitigations or workarounds are indicated.
CVE-2026-12295: Vulnerability in Mozilla Firefox
Description
CVE-2026-12295 is a high-impact sandbox escape vulnerability in the DOM Navigation component of Mozilla Firefox. This vulnerability allows code running in a sandboxed environment to escape those restrictions, potentially leading to elevated privileges or unauthorized actions. The issue was fixed in Firefox 152, Firefox ESR 140.12, and Firefox ESR 115.37. Multiple related security vulnerabilities were addressed in these releases, including other sandbox escapes and memory safety bugs. No known exploits in the wild have been reported at this time.
Affected software
pkg:github/mozilla/firefox-esrRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-12295 is a sandbox escape vulnerability in the DOM Navigation component of Mozilla Firefox. It was reported by Yaqoub Aldurayhim and fixed in Firefox 152, Firefox ESR 140.12, and Firefox ESR 115.37. The vulnerability allows escaping the browser's sandbox protections, which could enable an attacker to perform actions beyond the intended security boundaries. This issue is part of a broader set of high-impact security fixes released simultaneously by Mozilla, addressing multiple sandbox escapes and memory safety bugs across Firefox and Thunderbird. The vendor advisories confirm the fix and classify the impact as high.
Potential Impact
The vulnerability enables sandbox escape in the DOM Navigation component, which can allow malicious code to break out of the browser's sandbox environment. This could lead to privilege escalation or unauthorized access to system resources. The impact is rated high by Mozilla. No exploits in the wild are currently known, but the potential for serious security breaches exists if the vulnerability is exploited.
Mitigation Recommendations
Mozilla has fixed this vulnerability in Firefox 152, Firefox ESR 140.12, and Firefox ESR 115.37. Users and administrators should update to these versions or later to remediate the issue. Since this is a client-side application vulnerability, applying the official updates is the primary and recommended mitigation. No additional vendor-recommended mitigations or workarounds are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-06-15T15:08:08.316Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-57/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-58/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-59/","vendor":"Mozilla"}]
Threat ID: 6a314c7b0b89be6888b4cbce
Added to database: 6/16/2026, 1:15:39 PM
Last enriched: 6/16/2026, 1:46:50 PM
Last updated: 6/17/2026, 5:00:31 AM
Views: 8
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