CVE-2026-16365

Published: Jul 21, 2026Modified: Sep 1, 2026

8.8

Vector

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

Exploitability: 2.8 / Impact: 5.9

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Description

Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 153, Thunderbird 153, Firefox ESR 140.15, and Thunderbird 140.15.

Affected (2)

Products: Mozilla: Firefox, Thunderbird

Mozilla

2 products

Firefox

Thunderbird

Configuration A

2 vulnerable

Vulnerable Software	Affected Versions
Mozilla Firefox	Before 153.0.0
Mozilla Thunderbird	Before 153.0

Related CWEs

CWE-269

Improper Privilege Management

The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.

CWE-284

Improper Access Control

The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

References (5)

https://bugzilla.mozilla.org/show_bug.cgi?id=2049149

Source: security@mozilla.org

Permissions Required

https://www.mozilla.org/security/advisories/mfsa2026-68/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-71/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-84/

Source: security@mozilla.org

https://www.mozilla.org/security/advisories/mfsa2026-87/

Source: security@mozilla.org

Timeline

No history available yet.