CVE-2026-16365
An attacker can exploit multiple vulnerabilities in Mozilla Firefox and Mozilla Firefox ESR to execute arbitrary code, bypass security measures, disclose confidential information, escalate permissions, perform sandbox escapes, manipulate data, trigger a denial-of-service condition, or cause memory corruption.
CSIRTS triage
- What
- Multiple vulnerabilities have been identified in Mozilla products.
- Who is affected
- All deployments of affected Mozilla products are at risk.
- Urgency
- Remediation is important as these vulnerabilities may be exploited later.
- Action
- Update to the latest versions of affected Mozilla products.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.27% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 19% of all EPSS-scored CVEs.
Advisory coverage (5)
- high[NEW] [high] Mozilla Firefox and Firefox ESR: Multiple vulnerabilitiescert-bund · 2026-07-31
- unknownMultiple vulnerabilities in Mozilla Thunderbird (July 23, 2026)cert-fr-avis · 2026-07-23
- unknownMozilla Products Multiple Vulnerabilitieshkcert · 2026-07-22
- unknownMultiple vulnerabilities in Mozilla products (July 22, 2026)cert-fr-avis · 2026-07-22
- highCVE-2026-16365: Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 15…nvd · 2026-07-21
External references
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[](https://www.csirts.com/cve/CVE-2026-16365)