CVE-2026-12313

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

State: Published
Severity: 4.7 Medium
Published: Jun 16, 2026
Updated: Jun 16, 2026
Reserved: Jun 15, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	4.7 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N	CISA-ADP

Weaknesses

CWE-269 Improper Privilege Management

Affected Products

Product	Versions
FirefoxMozilla	140.12 through 140.*Not affected 152 and laterNot affected
ThunderbirdMozilla	140.12 through 140.*Not affected 152 and laterNot affected

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2040477
https://www.mozilla.org/security/advisories/mfsa2026-57/
https://www.mozilla.org/security/advisories/mfsa2026-58/
https://www.mozilla.org/security/advisories/mfsa2026-60/
https://www.mozilla.org/security/advisories/mfsa2026-61/

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