{"id":"CVE-2026-70309","aliases":["EUVD-2026-67853","GHSA-j3c8-38vp-j837"],"status":"published","title":"Microsoft Edge (Chromium-based) Security Feature Bypass Vulnerability","description":"Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to bypass a security feature over a network.","severity":{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00212,"percentile":0.11546,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-346"],"published":"2026-08-28T17:45:35Z","modified":"2026-11-10T22:01:10Z","products":[{"vendor":"microsoft","product":"edge_chromium"},{"vendor":"microsoft","product":"microsoft edge (chromium-based)"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70309","tags":["vendor-advisory","patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-70309"},{"url":"https://github.com/advisories/GHSA-j3c8-38vp-j837"}],"sources":{"cve":[{"id":"CVE-2026-70309","title":"Microsoft Edge (Chromium-based) Security Feature Bypass Vulnerability","description":"Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to bypass a security feature over a network.","status":"published","published":"2026-08-28T17:45:35.711Z","modified":"2026-11-10T22:01:10.241Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C","level":"medium","assessor":"cna"}],"cwes":["CWE-346"],"updated_at":"2026-11-10T23:49:31.13916Z"}],"euvd":[{"id":"EUVD-2026-67853","description":"Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to bypass a security feature over a network.","status":"published","published":"2026-08-28T17:45:35Z","modified":"2026-11-10T22:01:10Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C","level":"medium"}],"updated_at":"2026-11-10T23:24:16.163953Z"}],"ghsa":[{"id":"GHSA-j3c8-38vp-j837","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 bypass a security feature over a network.","status":"published","published":"2026-08-28T21:31:16Z","modified":"2026-08-28T21:31:24Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-346"],"updated_at":"2026-11-02T15:11:08.095363Z"}],"nvd":[{"id":"CVE-2026-70309","description":"Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to bypass a security feature over a network.","status":"published","published":"2026-08-28T20:19:40.267Z","modified":"2026-08-31T22:29:18.25Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-346"],"updated_at":"2026-11-02T14:12:42.366888Z"}]}}