PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-16367 Mozilla CVE debrief

A critical vulnerability, CVE-2026-16367, was found in the Disability Access APIs component of Firefox and Thunderbird. This issue allows for sandbox escape due to an invalid pointer. The vulnerability was fixed in Firefox 153 and Thunderbird 153. Users and administrators should review the official advisories for detailed information on affected versions and mitigation steps.

Vendor
Mozilla
Product
Firefox
CVSS
CRITICAL 10
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-21
Original CVE updated
2026-07-22
Advisory published
2026-07-21
Advisory updated
2026-07-22

Who should care

Users of Firefox and Thunderbird should update to versions 153 or later to mitigate this vulnerability. System administrators and security teams should prioritize patching and review system configurations for potential exposure. This vulnerability has a high impact on confidentiality, integrity, and availability.

Technical summary

The CVE-2026-16367 vulnerability is caused by an invalid pointer in the Disability Access APIs component, leading to a sandbox escape. It has a CVSS score of 10 and is classified as CRITICAL. The vulnerability was publicly disclosed on 2026-07-21T13:17:05.240Z and last modified on 2026-07-22T20:16:53.027Z. Affected products include Firefox and Thunderbird. Users should update to versions 153 or later to mitigate this vulnerability.

Defensive priority

High

Recommended defensive actions

  • Update Firefox to version 153 or later
  • Update Thunderbird to version 153 or later
  • Review system configurations for potential exposure
  • Perform vulnerability scanning to identify exposed systems
  • Implement compensating controls for exposed systems
  • Monitor for suspicious activity related to this vulnerability
  • Track exceptions and retest remediated assets

Evidence notes

The CVE record was published on 2026-07-21T13:17:05.240Z and was last modified on 2026-07-22T20:16:53.027Z. The NVD entry is currently Undergoing Analysis. This information is based on the CVE.org and NVD sources. Defenders should verify the affected scope and severity with these sources.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-16367 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-16367

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

  • CVE-2026-16367 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-16367

    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.