On July 2, 2026, the French national CERT (CERT-FR) issued an advisory about multiple vulnerabilities discovered in Mozilla Thunderbird. The flaws can allow an attacker to compromise data integrity and cause a denial‑of‑service. Affected software includes Thunderbird versions older than 140.12.1 and those older than 152.0.1. The alert references two Mozilla security bulletins, MFSA 2026‑63 and MFSA 2026‑64, published on June 30, 2026. It also lists two CVE identifiers, CVE‑2026‑57962 and CVE‑2026‑57963. Users of vulnerable Thunderbird versions are urged to update to the latest release, following the fix instructions provided in Mozilla’s bulletins. The advisory was released by the French Ministry of the Interior and the National Cybersecurity Agency.
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