CVE-2026-92047 Mozilla CVE debrief

Who should care

Defenders responsible for Mozilla products, particularly those with high-risk exposure, should assess and prioritize patching affected versions. The vulnerability has a CVSS score of 8.8 and a severity of HIGH, indicating a high level of risk. Defenders should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Why it matters

CVE-2026-92047 is a high-severity vulnerability in Mozilla's Crash Reporting component, allowing for privilege escalation. Defenders should prioritize verifying and applying patches for affected products, particularly those with high-risk exposure, and monitor for potential exploitation attempts.

• Verify and prioritize patching for affected Mozilla products to prevent potential privilege escalation
• Assess exposure of Mozilla products in your environment to determine risk
• Monitor for potential exploitation attempts targeting this vulnerability

Technical summary

The vulnerability, CVE-2026-92047, is a high-severity issue in the Crash Reporting component of Mozilla products, including Firefox and Thunderbird. It allows for privilege escalation and was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3. The vulnerability has a CVSS score of 8.8 and a severity of HIGH. Defenders should prioritize verifying and applying patches for affected Mozilla products, particularly those with high-risk exposure. The vulnerability was reported by security researchers and patched by Mozilla.

Defensive priority

Defenders should prioritize verifying and applying patches for affected Mozilla products, particularly those with high-risk exposure.

Recommended defensive actions

• Verify and apply patches for affected Mozilla products
• Assess exposure of Mozilla products in your environment
• Monitor for potential exploitation attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, its CVSS score, and affected products. Vendor advisories offer guidance on patched versions. The vulnerability was reported by security researchers and patched by Mozilla. The CVE record was published on 2026-09-15T13:16:56.373Z and has not been modified since then. The NVD entry provides additional information on the vulnerability, including its CVSS score and affected products.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.