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CVE-2026-109747 Mozilla CVE debrief

Mozilla Firefox vulnerability CVE-2026-109747 was published on 2026-10-13T12:29:27.947Z. The vulnerability, an other issue in the Address Bar component, was fixed in Firefox 158. Defenders should assess exposure and prioritize remediation based on their Firefox deployments. The CVE record and source item provide limited information about the vulnerability, and defenders should verify if their Firefox versions are prior to 158. The NVD entry is currently empty, and additional details may be found in the Mozilla security advisory.

Vendor
Mozilla
Product
Firefox
CVSS
Unknown
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-13
Original CVE updated
2026-10-13
Advisory published
2026-10-13
Advisory updated
2026-10-13

Who should care

Defenders responsible for Mozilla Firefox deployments should assess exposure and prioritize remediation. This includes operators, platform administrators, vulnerability management teams, and security teams who manage Firefox instances. They should verify if their Firefox versions are prior to 158 and update or mitigate accordingly.

Why it matters

CVE-2026-109747 is an other issue in the Address Bar component of Mozilla Firefox. Defenders should prioritize verifying if their Firefox versions are prior to 158 and assess exposure.

  • Verify Firefox version and update to 158 or later if necessary
  • Assess exposure and prioritize remediation

Technical summary

CVE-2026-109747 is an other issue in the Address Bar component of Mozilla Firefox. The vulnerability was fixed in Firefox 158. Defenders should prioritize verifying if their Firefox versions are prior to 158 and assess exposure. The CVE record and source item provide limited information about the vulnerability, and additional details may be found in the Mozilla security advisory.

Defensive priority

Defenders should prioritize verifying if their Firefox versions are prior to 158 and assess exposure.

Recommended defensive actions

  • Verify Firefox version and update to 158 or later if necessary
  • Assess exposure and prioritize remediation
  • 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
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide limited information about the vulnerability. The NVD entry is currently empty. Defenders should verify if their Firefox versions are prior to 158 and assess exposure. Evidence is limited to CVE metadata and Mozilla's security advisory for CVE-2026-109747.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-109747 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-109747

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

  • CVE-2026-109747 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-109747

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

Supplemental references

  • Other issue in the Address Bar component

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/109xxx/CVE-2026-109747.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://www.mozilla.org/security/advisories/mfsa2026-106/

    Supplemental source

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.