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Mozilla Firefox Multiple Vulnerabilities
September 30, 2026 · HKCERT · Severity: HIGH
This advisory from HKCERT details multiple vulnerabilities in Mozilla Firefox affecting versions prior to 157 and several ESR branches. The flaws could enable remote code execution, denial of service, privilege escalation, and information disclosure, prompting urgent patching recommendations. 📌 **Analyst Note:** Given the breadth of impacts including remote code execution, organizations should prioritize updating Firefox across all endpoints. The inclusion of multiple ESR versions indicates that even conservative update channels must act swiftly to close these critical security gaps.
Key Takeaways
- Multiple vulnerabilities in Mozilla Firefox, including flaws that could lead to remote code execution and denial of service, have been identified in versions prior to Firefox 157 and several ESR releases.
- A remote attacker could exploit these vulnerabilities to bypass security restrictions, disclose sensitive information, or spoof content, posing significant risks to users of unpatched browsers.
- Users are strongly advised to update to Firefox 157, Firefox ESR 115.42, ESR 140.17, or ESR 153.4 immediately to mitigate the potential for exploitation and protect against these critical security issues.