CVE-2026-16412
Multiple security issues have been found in the Mozilla Firefox web browser, which could potentially result in the execution of arbitrary code, bypass of the same-origin policy, privilege escalation, information disclosure, spoofing or sandbox escape. https://security-tracker.debian.org/tracker/DSA-6394-1
CSIRTS triage
- What
- Multiple security issues in Firefox ESR could lead to arbitrary code execution and other security breaches.
- Who is affected
- Users of Mozilla Firefox ESR.
- Urgency
- Remediation is critical due to the potential for severe exploitation of these vulnerabilities.
- Action
- Apply the latest security update for Firefox ESR.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.33% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 26% of all EPSS-scored CVEs.
Advisory coverage (4)
- unknownMultiple vulnerabilities in Mozilla Thunderbird (July 23, 2026)cert-fr-avis · 2026-07-23
- unknownMultiple vulnerabilities in Mozilla products (July 22, 2026)cert-fr-avis · 2026-07-22
- unknownDSA-6394-1 firefox-esr - security updatedebian · 2026-07-22
- criticalCVE-2026-16412: Memory safety bugs present in Firefox ESR 140.12 and Firefox 152. Some of these bugs showed ev…nvd · 2026-07-21
External references
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[](https://www.csirts.com/cve/CVE-2026-16412)