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The WebChannel API, which is used to transport various information across processes, did not check the sending principal but rather accepted the principal being sent. This could have led to privilege escalation attacks. This vulnerability affects Firefox < 134, Firefox ESR < 128.6, Thunderbird < 134, and Thunderbird < 128.6.
Reserved 2025-01-06 | Published 2025-01-07 | Updated 2025-01-13 | Assigner mozillaWebChannel APIs susceptible to confused deputy attack
Andrew McCreight
bugzilla.mozilla.org/show_bug.cgi?id=1915257
www.mozilla.org/security/advisories/mfsa2025-01/
www.mozilla.org/security/advisories/mfsa2025-02/
www.mozilla.org/security/advisories/mfsa2025-04/
www.mozilla.org/security/advisories/mfsa2025-05/
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