{"id":"CVE-2026-66311","aliases":["EUVD-2026-52531","GHSA-78rr-mxgh-pv8f"],"status":"published","title":"Microsoft Edge (Chromium-based) Tampering Vulnerability","description":"Missing authorization in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform tampering locally.","severity":{"version":"3.1","score":6.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00405,"percentile":0.35238,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-862"],"published":"2026-08-03T22:57:53Z","modified":"2026-11-10T22:41:02Z","products":[{"vendor":"microsoft","product":"edge_chromium"},{"vendor":"microsoft","product":"microsoft edge (chromium-based)"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66311","tags":["vendor-advisory","patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-66311"},{"url":"https://github.com/advisories/GHSA-78rr-mxgh-pv8f"}],"sources":{"cve":[{"id":"CVE-2026-66311","title":"Microsoft Edge (Chromium-based) Tampering Vulnerability","description":"Missing authorization in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform tampering locally.","status":"published","published":"2026-08-03T22:57:53.525Z","modified":"2026-11-10T22:41:02.664Z","cvss":[{"version":"3.1","score":6.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C","level":"medium","assessor":"cna"}],"cwes":["CWE-862"],"updated_at":"2026-11-10T23:49:30.334266Z"}],"euvd":[{"id":"EUVD-2026-52531","description":"Missing authorization in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform tampering locally.","status":"published","published":"2026-08-03T22:57:53Z","modified":"2026-11-10T22:41:02Z","cvss":[{"version":"3.1","score":6.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C","level":"medium"}],"updated_at":"2026-11-11T00:24:46.475072Z"}],"ghsa":[{"id":"GHSA-78rr-mxgh-pv8f","title":"Missing authorization in Microsoft Edge (Chromium-based) allows an unauthorized attacker to...","description":"Missing authorization in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform tampering locally.","status":"published","published":"2026-08-04T00:34:54Z","modified":"2026-08-04T00:35:02Z","cvss":[{"version":"3.1","score":6.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-862"],"updated_at":"2026-11-02T15:10:03.433591Z"}],"nvd":[{"id":"CVE-2026-66311","description":"Missing authorization in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform tampering locally.","status":"published","published":"2026-08-04T00:17:38.373Z","modified":"2026-10-23T23:10:00.157Z","cvss":[{"version":"3.1","score":6.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-862"],"updated_at":"2026-11-02T14:12:34.643497Z"}]}}