CVE-2026-84121

Description

Sandbox escape due to use-after-free in the DOM: Security component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

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Produits concernés

• Mozilla Firefox
• Mozilla Thunderbird

Scores CVSS

Faiblesses (CWE)

• CWE-416

Références

• https://bugzilla.mozilla.org/show_bug.cgi?id=2059018 Permissions Required
• https://www.mozilla.org/security/advisories/mfsa2026-82/ Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2026-83/ Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2026-84/ Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2026-85/ Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2026-86/ Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2026-87/ Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2026-88/ Vendor Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories