{"id":"CVE-2026-66798","title":"Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability","summary":"Use after free in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.","severity":"medium","cvss":4.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C","cvssSource":"cna","cwe":["CWE-416","CWE-77"],"vendor":"Microsoft","product":"Microsoft Edge (Chromium-based)","affected":["edge_chromium-based -","edge_for_android >= 1.0.0.0 < 152.0.4191.52","edge_for_ios >= 1.0.0.0 < 152.0.4191.52","edge_for_linux >= 1.0.0 < 152.0.4191.52","edge_for_mac >= 1.0.0.0 < 152.0.4191.52","edge_for_windows >= 1.0.0.0 < 152.0.4191.52"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-08-29T03:56:13.736994Z"},"published":"2026-08-28","updated":"2026-10-21","sourceUpdated":"2026-10-21T20:54:56.722Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-66798","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66798","label":"Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-66798.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-66798"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2507993"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-66798"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-66798"},{"url":"https://access.redhat.com/errata/RHSA-2026:60387"},{"url":"https://access.redhat.com/errata/RHSA-2026:60390"},{"url":"https://access.redhat.com/errata/RHSA-2026:60388"},{"url":"https://access.redhat.com/errata/RHSA-2026:60389"},{"url":"https://access.redhat.com/errata/RHSA-2026:60391"},{"url":"https://access.redhat.com/errata/RHSA-2026:60386"}],"tags":["cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00786,"epssPercentile":0.55922,"patched":["advanced_cluster_management_for_kubernetes 2.11","advanced_cluster_management_for_kubernetes 2.13","advanced_cluster_management_for_kubernetes 2.14","advanced_cluster_management_for_kubernetes 2.15","advanced_cluster_management_for_kubernetes 2.16","advanced_cluster_management_for_kubernetes 2.17"],"scores":{"cna":4.3,"vendor":8.8},"ingestedAt":"2026-09-14T00:35:28.548Z","slug":"CVE-2026-66798","body":"## Overview\n\nUse after free in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.\n\n## Affected\n\n- `edge_chromium-based -`\n- `edge_for_android >= 1.0.0.0 < 152.0.4191.52`\n- `edge_for_ios >= 1.0.0.0 < 152.0.4191.52`\n- `edge_for_linux >= 1.0.0 < 152.0.4191.52`\n- `edge_for_mac >= 1.0.0.0 < 152.0.4191.52`\n- `edge_for_windows >= 1.0.0.0 < 152.0.4191.52`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:60387** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.11 · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:60387)\n- **RHSA-2026:60390** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.13 · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:60390)\n- **RHSA-2026:60388** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.14 · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:60388)\n- **RHSA-2026:60389** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.15 · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:60389)\n- **RHSA-2026:60391** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.16 · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:60391)\n- **RHSA-2026:60386** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.17 · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:60386)","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":23.7,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[{"seq":218247,"id":"CVE-2026-66798","ts":1791486158421,"field":"cvss","old":"8.8","new":"4.3"},{"seq":218246,"id":"CVE-2026-66798","ts":1791486158421,"field":"severity","old":"high","new":"medium"},{"seq":217233,"id":"CVE-2026-66798","ts":1791360788059,"field":"cvss","old":"4.3","new":"8.8"},{"seq":217232,"id":"CVE-2026-66798","ts":1791360788059,"field":"severity","old":"medium","new":"high"}]}