CVE-2026-4688

Advisory lineage Upstream: 0 Downstream: 41
Modified
Published: 24 Mar 2026, 12:30
Last modified:15 Jul 2026, 00:49

Vulnerability Summary

Overall Risk (default)
high
70/100
CVSS Score
10 CRITICAL
v3.1 (nvd)
EPSS Score
0.53% LOW
1% probability +0.12%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

24 Mar 2026, 12:30
Published
Vulnerability first disclosed
15 Jul 2026, 00:49
Last Modified
Vulnerability information updated

Description

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.

CVSS Metrics

  • v3.1•CRITICAL•Score: 10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
  • v3.1•CRITICAL•Score: 9.6CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.53%• Percentile: 41%

Techniques & Countermeasures

  • CWE-416•Use After Free

    The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

  • CWE-825•Expired Pointer Dereference

    The product dereferences a pointer that contains a location for memory that was previously valid, but is no longer valid.

Affected Systems

  • mozilla•firefox

    ≥ unspecified, < 149 | < 140.9.0 | < 149.0

  • mozilla•firefox_esr

    ≥ unspecified, < 140.9

  • mozilla•thunderbird

    ≥ unspecified, < 149 | ≥ unspecified, < 140.9

References (33)