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CVE-2026-8401 critical CVSS 9.8

Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 150.0.3.

Summary

Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 150.0.3.

AI summary snake-internal / snake-template-v1

A weakness called CVE-2026-8401 was discovered in Mozilla Firefox. Severity is Critical (CVSS 9.8/10). If exploited, attackers can fully take over the affected system. What you should do: update the affected software to the latest version. If unsure, ask your IT team or search the vendor's site for "Mozilla CVE-2026-8401".
CVE-2026-8401 (Mozilla Firefox). Severity: Critical / CVSSv3 9.8. Category: CWE-693. Response plan: 1. Check the vendor advisory for affected versions and the patched release. 2. If a vulnerable version is running in production, schedule maintenance (urgency from KEV/CVSS). 3. If no patch yet, mitigate via WAF rule, disabling the affected feature, etc. 4. Monitor logs / SIEM for known IOC and PoC signatures of this CVE. PoCs and fix commits: see the 'References' section, MITRE, and NVD.
❓ What is the problem
A weakness (CVE-2026-8401) in Mozilla Firefox. A serious software flaw has been identified.
📍 Affected scope
Target versions of Mozilla Firefox (see vendor advisory). If running in production, identify exposure immediately.
🔥 Severity
Severity: Critical (CVSS 9.8/10). If exploited, attackers can fully take over the affected system.
🔧 How to fix
Update to the patched release as listed in the vendor advisory. (Typical mitigation pattern for CWE-693)
🛡️ Workaround
If a patch is not yet available, consider disabling the affected feature, applying WAF rules, blocking via network ACLs, or isolating the vulnerable version.
🔍 Detection
Check version information, scan dependencies via SBOM, and monitor SIEM for IOC and PoC signatures related to this CVE.

References

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