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.
Official resources
AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-21T13:17:05.240Z and has not been modified since then. The NVD entry is currently Undergoing Analysis.