CVE-2026-12294

Published: Jun 16, 2026Modified: Jul 15, 2026

9.6

Vector

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

Exploitability: 2.8 / Impact: 6.0

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

Description

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

Affected (5)

Products: Mozilla: Firefox, Thunderbird

2 products

Configuration A

5 vulnerable

Vulnerable Software	Affected Versions
Mozilla Firefox	Before 152.0.0
Mozilla Firefox	Before 115.37.0
Mozilla Firefox	From 128.0 to 140.12.0
Mozilla Thunderbird	Before 152.0.0
Mozilla Thunderbird	Before 140.12.0

Related CWEs

Incorrect Privilege Assignment

A product incorrectly assigns a privilege to a particular actor, creating an unintended sphere of control for that actor.

Protection Mechanism Failure

The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.

References (30)

https://bugzilla.mozilla.org/show_bug.cgi?id=2039873

Source: security@mozilla.org

Permissions Required

https://www.mozilla.org/security/advisories/mfsa2026-57/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-58/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-59/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-60/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-61/

Source: security@mozilla.org

Vendor Advisory

https://access.redhat.com/errata/RHSA-2026:27717

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

https://access.redhat.com/errata/RHSA-2026:27733

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

https://access.redhat.com/errata/RHSA-2026:27734

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

https://access.redhat.com/errata/RHSA-2026:29940

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

https://access.redhat.com/errata/RHSA-2026:30846

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

https://access.redhat.com/errata/RHSA-2026:33445

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

https://access.redhat.com/errata/RHSA-2026:36100

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

https://access.redhat.com/errata/RHSA-2026:36101

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

https://access.redhat.com/errata/RHSA-2026:36102

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

https://access.redhat.com/errata/RHSA-2026:36103

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

https://access.redhat.com/errata/RHSA-2026:37210

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

https://access.redhat.com/errata/RHSA-2026:37391

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

https://access.redhat.com/errata/RHSA-2026:38506

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

https://access.redhat.com/errata/RHSA-2026:38750

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

https://access.redhat.com/errata/RHSA-2026:38751

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

https://access.redhat.com/errata/RHSA-2026:38753

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

https://access.redhat.com/errata/RHSA-2026:39011

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

https://access.redhat.com/errata/RHSA-2026:39141

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

https://access.redhat.com/errata/RHSA-2026:39142

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

https://access.redhat.com/errata/RHSA-2026:39428

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

https://access.redhat.com/errata/RHSA-2026:39706

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

https://access.redhat.com/security/cve/CVE-2026-12294

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

https://bugzilla.redhat.com/show_bug.cgi?id=2489207

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12294.json

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

Timeline

No history available yet.