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Description

Mitigation bypass in the DOM: postMessage component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

PUBLISHED Reserved 2026-04-21 | Published 2026-04-21 | Updated 2026-04-21 | Assigner mozilla

Product status

150 (rpm)
unaffected

150 (rpm)
unaffected

Credits

paranoidmoth

References

bugzilla.mozilla.org/show_bug.cgi?id=1880429

www.mozilla.org/security/advisories/mfsa2026-30/

www.mozilla.org/security/advisories/mfsa2026-33/

cve.org (CVE-2026-6755)

nvd.nist.gov (CVE-2026-6755)

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