CVE-2026-8401

9.8 CRITICAL

Published: May 12, 2026 Modified: May 19, 2026

Description

Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

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

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

https://bugzilla.mozilla.org/show_bug.cgi?id=2038679

Source: security@mozilla.org

Permissions Required

https://www.mozilla.org/security/advisories/mfsa2026-45/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-47/

Source: security@mozilla.org

https://www.mozilla.org/security/advisories/mfsa2026-48/

Source: security@mozilla.org

https://www.mozilla.org/security/advisories/mfsa2026-51/

Source: security@mozilla.org

5 reference(s) from NVD

Quick Stats

CVSS v3 Score

9.8 / 10.0

EPSS (Exploit Probability)

0.1%

26th percentile

Exploitation Status

Not in CISA KEV

Weaknesses (CWE)

CWE-693

Affected Vendors

mozilla

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