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PatchSiren cyber security CVE debrief

CVE-2026-6756 Mozilla CVE debrief

A mitigation bypass vulnerability in Firefox for Android was fixed in Firefox 150. This vulnerability allows attackers to bypass existing mitigations, potentially leading to further exploitation. Defenders should assess exposure, prioritize verification of affected systems, and ensure timely remediation to Firefox 150. Verification of Firefox for Android systems for exposure to untrusted input is necessary, especially in environments where user input is not strictly controlled. The vulnerability has a CVSS score of 7.5 and is classified as HIGH, indicating significant potential impact.

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 Firefox for Android systems, especially those with exposure to untrusted input, should assess exposure and prioritize verification.

Why it matters

A mitigation bypass vulnerability in Firefox for Android was fixed in Firefox 150. Defenders should assess exposure, prioritize verification of affected systems, and ensure timely remediation.

  • Verification of Firefox for Android systems for exposure to untrusted input is necessary
  • Timely remediation to Firefox 150 is required to mitigate potential exploitation
  • Monitoring for potential exploitation attempts is recommended

Technical summary

A mitigation bypass vulnerability in Firefox for Android was fixed in Firefox 150. The vulnerability has a CVSS score of 7.5 and is classified as HIGH. This vulnerability allows attackers to bypass existing security mitigations, potentially leading to further exploitation. The affected product is Firefox for Android, and the vulnerability was addressed in Firefox 150. Defenders should prioritize verification of affected systems, especially those with exposure to untrusted input, and ensure timely remediation.

Defensive priority

Defenders should prioritize verification of Firefox for Android systems, especially those with exposure to untrusted input.

Recommended defensive actions

  • Verify Firefox for Android systems for exposure to untrusted input
  • Ensure timely remediation to Firefox 150
  • Monitor for potential exploitation attempts

Evidence notes

The CVE record and NVD entry provide details on the mitigation bypass vulnerability in Firefox for Android, which was fixed in Firefox 150. The vulnerability is identified as a mitigation bypass, indicating that existing security measures may not be sufficient to prevent exploitation. Defenders should verify the presence of affected systems, especially those exposed to untrusted input, and ensure timely remediation. The source details are limited, so defenders should exercise caution,

Sources and references

Verified primary and authoritative sources

  • CVE-2026-6756 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-6756

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

  • CVE-2026-6756 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-6756

    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.