CVE-2026-12311

4.7 MEDIUM

Information disclosure, sandbox escape in the Security: Process Sandboxing component

Published: 2026-06-16 · Last updated: 2026-06-16

Severity and scoring

CVSS: 4.7 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
CWE: CWE-200, CWE-688

Affected products

Vendor	Product
mozilla	firefox, thunderbird

Description

Information disclosure, sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-12311
[Other]https://bugzilla.mozilla.org/show_bug.cgi?id=2040177
[Vendor advisory]https://www.mozilla.org/security/advisories/mfsa2026-57/
[Vendor advisory]https://www.mozilla.org/security/advisories/mfsa2026-58/
[Vendor advisory]https://www.mozilla.org/security/advisories/mfsa2026-60/
[Vendor advisory]https://www.mozilla.org/security/advisories/mfsa2026-61/

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CVE-2026-12323 — Spoofing issue in the DOM: Core & HTML component (5.4 MEDIUM)
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