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PatchSiren cyber security CVE debrief

CVE-2026-6782 Mozilla CVE debrief

The IP Protection component in Mozilla Firefox and Thunderbird is vulnerable to information disclosure. This vulnerability was fixed in Firefox 150 and Thunderbird 150. Defenders responsible for managing and securing Mozilla Firefox and Thunderbird deployments should assess exposure and apply security updates to prevent potential information disclosure. The vulnerability allows attackers to access sensitive information, which can lead to further exploitation. Affected product deployments should be identified, and owners should be assigned for follow-up. The official CVE Program record and NIST NVD detail page provide information about the vulnerability.

Vendor
Mozilla
Product
Firefox
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-21
Original CVE updated
2026-10-26
Advisory published
2026-04-21
Advisory updated
2026-10-26

Who should care

Defenders responsible for managing and securing Mozilla Firefox and Thunderbird deployments should assess exposure and apply security updates to prevent potential information disclosure.

Why it matters

The information disclosure vulnerability in Mozilla Firefox and Thunderbird requires defenders to verify and apply security updates to prevent potential information disclosure incidents.

  • Verify and apply security updates to prevent information disclosure.
  • Review and update inventory of deployed Firefox and Thunderbird versions.
  • Monitor for potential information disclosure incidents.

Technical summary

The IP Protection component in Mozilla Firefox and Thunderbird is vulnerable to information disclosure. This vulnerability was fixed in Firefox 150 and Thunderbird 150. The vulnerability allows attackers to access sensitive information, which can lead to further exploitation. Defenders should prioritize verifying and applying the security updates for Mozilla Firefox and Thunderbird to prevent potential information disclosure. The official CVE Program record and NIST NVD detail page provide information about the vulnerability.

Defensive priority

Defenders should prioritize verifying and applying the security updates for Mozilla Firefox and Thunderbird to prevent potential information disclosure.

Recommended defensive actions

  • Verify and apply the security updates for Mozilla Firefox and Thunderbird.
  • Review and update inventory of deployed Firefox and Thunderbird versions.
  • Monitor for potential information disclosure incidents.

Evidence notes

The CVE record and NVD entry provide information about an information disclosure vulnerability in the IP Protection component of Mozilla Firefox and Thunderbird, which was fixed in Firefox 150 and Thunderbird 150.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-6782 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-6782

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

  • CVE-2026-6782 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-6782

    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.