CVE-2026-12295criticalCWE-653 CWE-693

Sandbox escape in the DOM: Navigation component

48Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 9.6epss 0.4%

from disclosure to weapon70 days

Published on NVDJun 16

1st PoC+70d

exploitation probability

0.4%top 68% of all CVEs

observed exploitation

nono source reports it

1 public exploit(s)

Sandbox escape in the DOM: Navigation component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

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

Affected products

Mozilla · Firefox Mozilla · Thunderbird

public PoCs found — 1

githubgithub.com/SneakyNachos/CVE-2026-12295-UXXS-in-my-wasm★ 1

⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

References