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CVE-2026-84117 Mozilla CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-09-01T13:20:05.487Z and has not been modified since then. CVE-2026-84117 is a high-severity privilege escalation vulnerability in Firefox for Android, fixed in Firefox 155. The vulnerability may allow attackers to gain elevated privileges on affected systems, potentially leading to unauthorized access or malicious activity. Limited details are available, and further verification is recommended. Evidence from the CVE Program and NIST NVD suggests that this vulnerability may impact Firefox Mobile users and Android device administrators. However, the exact scope and potential exposure remain unclear, requiring additional verification and review. It is essential for Mozilla Firefox Mobile users, Android device administrators, and security teams to assess their deployments and take necessary actions.

Vendor
Mozilla
Product
Firefox Mobile
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-01
Original CVE updated
2026-09-03
Advisory published
2026-09-01
Advisory updated
2026-09-03

Who should care

Mozilla Firefox Mobile users, Android device administrators, and security teams responsible for managing Firefox deployments should be aware of this high-severity privilege escalation vulnerability. They should assess their environments for potential exposure, review vendor guidance, and plan updates or mitigations accordingly. Additionally, security teams should monitor Firefox Mobile for any suspicious activity and review compensating controls for exposed systems while remediation is scheduled and verified.

Technical summary

CVE-2026-84117 is a high-severity privilege escalation vulnerability in Firefox for Android. The vulnerability was fixed in Firefox 155. Users should update to prevent potential exploitation. This vulnerability may allow attackers to gain elevated privileges on affected systems, potentially leading to unauthorized access or malicious activity. It is essential for Mozilla Firefox Mobile users, Android device administrators, and security teams to assess their deployments and take necessary actions.

Defensive priority

Mozilla Firefox Mobile users should prioritize updating to version 155 or later to address a high-severity privilege escalation vulnerability.

Recommended defensive actions

  • Update Firefox Mobile to version 155 or later
  • Verify Android device configurations for potential exposure
  • Monitor Firefox Mobile for any suspicious activity

Evidence notes

The CVE-2026-84117 record indicates a high-severity privilege escalation vulnerability in Firefox for Android, fixed in Firefox 155. Limited details are available, and further verification is recommended. Evidence from the CVE Program and NIST NVD suggests that this vulnerability may impact Firefox Mobile users and Android device administrators. However, the exact scope and potential exposure remain unclear, requiring additional verification and review.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-84117 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-84117

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-84117 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-84117

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental 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.