CVE-2026-4688NVD

Vulnerability Summary

Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

Severity Level

CRITICAL(10.0)

Published Date

Mar 24, 2026

Last Modified

Jun 30, 2026

Exploitation Status

No confirmed exploitation yet

EPSS Score (30-Day)

0.53%Probability

Root Weakness (CWE)

CWE-416: Unknown/Unlisted Weakness ↗

Refer to the official MITRE database for detailed architectural specifications regarding this weakness.

CWE-825: Unknown/Unlisted Weakness ↗

Refer to the official MITRE database for detailed architectural specifications regarding this weakness.

CVSS v3.1 Base Metrics — Score 10.0 (CRITICAL)

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeChanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

Affected & Patched Versions

Affected Versions

Mozilla Firefox < 140.9.0
Mozilla Firefox < 149.0

Patched Versions

Mozilla Firefox 140.9.0
Mozilla Firefox 149.0

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