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Description

Sandbox escape in the Messaging System component. This vulnerability affects Firefox < 147 and Thunderbird < 147.

PUBLISHED Reserved 2026-01-13 | Published 2026-01-13 | Updated 2026-01-15 | Assigner mozilla

Product status

Any version before 147
affected

Any version before 147
affected

Credits

Andrew McCreight

References

bugzilla.mozilla.org/show_bug.cgi?id=2005845

www.mozilla.org/security/advisories/mfsa2026-01/

www.mozilla.org/security/advisories/mfsa2026-04/

cve.org (CVE-2026-0881)

nvd.nist.gov (CVE-2026-0881)

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