CVE-2026-16358
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 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 risk0.22% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 12% of all EPSS-scored CVEs.
Advisory coverage (6)
- 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
- unknownDSA-6394-1 firefox-esr - security updatedebian · 2026-07-22
- criticalCVE-2026-16358: Site isolation issue in the Graphics: WebRender component. This vulnerability was fixed in Fir…nvd · 2026-07-21
External references
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[](https://www.csirts.com/cve/CVE-2026-16358)