CVE-2026-16367

CRITICAL

Published Jul 21, 2026 Modified Jul 24, 2026 CWE-119 CWE-416 CWE-787

Description

Sandbox escape due to invalid pointer in the Disability Access APIs component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

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CVSS v3.1 Score

10.0

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0038

Probability of exploitation

0.30%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-119 Buffer Overflow

CWE-416 Use After Free

CWE-787 Out-of-bounds Write

Affected Products

Vendor	Product	Versions
mozilla	firefox	< 153.0.0
mozilla	thunderbird	< 153.0

References

Advisories & Patches

https://www.mozilla.org/security/advisories/mfsa2026-68/ https://www.mozilla.org/security/advisories/mfsa2026-71/

Other References

https://bugzilla.mozilla.org/show_bug.cgi?id=2050627

Frequently Asked Questions

What is CVE-2026-16367? +

Sandbox escape due to invalid pointer in the Disability Access APIs component. This vulnerability was fixed in Firefox 153 and Thunderbird 153. It has a CVSS v3.1 base score of 10.0 (CRITICAL).

How severe is CVE-2026-16367? +

CVE-2026-16367 has a CVSS v3.1 score of 10.0 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0038, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-16367? +

CVE-2026-16367 affects products from mozilla, specifically: firefox, thunderbird. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-16367? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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