CVE-2026-74939

Description

Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

References

https://github.com/SneakyNachos/CVE-2026-4692-trust-me-im-in-rdm

https://github.com/SneakyNachos/CVE-2026-12295-UXXS-in-my-wasm

https://github.com/SneakyNachos/CVE-2026-74939-escape-the-mac-n-cheese-box

https://www.mozilla.org/security/advisories/mfsa2026-80/

https://www.mozilla.org/security/advisories/mfsa2026-79/

https://www.mozilla.org/security/advisories/mfsa2026-78/

https://www.mozilla.org/security/advisories/mfsa2026-77/

https://www.mozilla.org/security/advisories/mfsa2026-76/

https://www.mozilla.org/security/advisories/mfsa2026-75/

https://www.mozilla.org/security/advisories/mfsa2026-74/

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-60746

https://bugzilla.mozilla.org/show_bug.cgi?id=2054416

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

EPSS