CVE-2024-6611 A nested iframe, triggering a cross-site navigation, could send SameSite=Strict or Lax cookies. This vulnerability affects Firefox < 128 and Thunderbird < 128.

Api.Msrc.Microsoft • February 18, 2026

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Vulnerabilities Affecting SameSite Cookie Protections in Firefox and Thunderbird Two vulnerabilities have been identified affecting SameSite cookie protections in Firefox and Thunderbird. CVE-2022-45410, published on December 22, 2022, impacts Firefox ESR versions below 102.5 and Thunderbird versions below 102.5, while CVE-2024-6611, published on July 9, 2024, affects Firefox versions below 128 and Thunderbird versions below 128. Both vulnerabilities allow for potential cross-site request forgery attacks due to improper handling of cookies. 2 sources 62

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Platforms (2)

Firefox Thunderbird