{
  "threat_severity" : "Moderate",
  "public_date" : "2026-04-21T12:40:57Z",
  "bugzilla" : {
    "description" : "firefox: thunderbird: Mitigation bypass in the File Handling component",
    "id" : "2460101",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2460101"
  },
  "cvss3" : {
    "cvss3_base_score" : "6.1",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
    "status" : "verified"
  },
  "cwe" : "CWE-66",
  "details" : [ "A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:\nMitigation bypass in the File Handling component" ],
  "statement" : "Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.",
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "release_date" : "2026-04-27T00:00:00Z",
    "advisory" : "RHSA-2026:10767",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10.1",
    "package" : "firefox-0:140.10.0-1.el10_1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-04-27T00:00:00Z",
    "advisory" : "RHSA-2026:10766",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8",
    "package" : "firefox-0:140.10.0-1.el8_10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-04-27T00:00:00Z",
    "advisory" : "RHSA-2026:10757",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "firefox-0:140.10.0-1.el9_7"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Affected",
    "package_name" : "rhel10/firefox-flatpak",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Affected",
    "package_name" : "rhel10/thunderbird-flatpak",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Affected",
    "package_name" : "thunderbird",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Out of support scope",
    "package_name" : "firefox",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Out of support scope",
    "package_name" : "thunderbird",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Affected",
    "package_name" : "firefox",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Out of support scope",
    "package_name" : "thunderbird",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Affected",
    "package_name" : "thunderbird",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Affected",
    "package_name" : "thunderbird",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-6763\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-6763\nhttps://www.mozilla.org/security/advisories/mfsa2026-32/#CVE-2026-6763\nhttps://www.mozilla.org/security/advisories/mfsa2026-34/#CVE-2026-6763" ],
  "name" : "CVE-2026-6763",
  "csaw" : false
}