{"id":"CVE-2026-66313","aliases":["EUVD-2026-52525","GHSA-8q78-vm89-wh64"],"status":"published","title":"Microsoft Edge (Chromium-based) Tampering Vulnerability","description":"Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform tampering locally.","severity":{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N/E:U/RL:O/RC:C","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00234,"percentile":0.14342,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-346"],"published":"2026-08-03T22:53:11Z","modified":"2026-11-01T17:33:18Z","products":[{"vendor":"microsoft","product":"edge_chromium"},{"vendor":"microsoft","product":"microsoft edge (chromium-based)"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66313","tags":["vendor-advisory","patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-66313"},{"url":"https://github.com/advisories/GHSA-8q78-vm89-wh64"}],"sources":{"cve":[{"id":"CVE-2026-66313","title":"Microsoft Edge (Chromium-based) Tampering Vulnerability","description":"Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform tampering locally.","status":"published","published":"2026-08-03T22:53:11.479Z","modified":"2026-11-01T17:33:18.487Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N/E:U/RL:O/RC:C","level":"medium","assessor":"cna"}],"cwes":["CWE-346"],"updated_at":"2026-11-02T14:20:13.272106Z"}],"euvd":[{"id":"EUVD-2026-52525","description":"Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform tampering locally.","status":"published","published":"2026-08-03T22:53:11Z","modified":"2026-11-01T17:33:18Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N/E:U/RL:O/RC:C","level":"medium"}],"updated_at":"2026-11-02T16:58:48.785826Z"}],"ghsa":[{"id":"GHSA-8q78-vm89-wh64","title":"Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to...","description":"Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform tampering locally.","status":"published","published":"2026-08-04T00:34:54Z","modified":"2026-08-04T00:34:55Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","level":"medium"}],"cwes":["CWE-346"],"updated_at":"2026-11-02T15:10:03.433591Z"}],"nvd":[{"id":"CVE-2026-66313","description":"Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform tampering locally.","status":"published","published":"2026-08-04T00:17:38.647Z","modified":"2026-10-23T23:10:00.157Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-346"],"updated_at":"2026-11-02T14:12:34.643497Z"}]}}