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Fencer Vulns
medium 4.3

CVE-2026-66798 json

Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability

published 2026-08-28 2 mo ago modified 2026-10-30 9 d ago also EUVD-2026-67851

cvss
4.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 56%
public exploits
0
none known

Summary

Use after free in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.

Patch / fix

  • Microsoft Microsoft Edge (Chromium-based) 152.0.4191.53
  • Microsoft Microsoft Edge for Android 152.0.4191.52
  • Microsoft Microsoft Edge for iOS 152.0.4191.52
  • Microsoft Microsoft Edge for Linux 152.0.4191.52
  • Microsoft Microsoft Edge for MAC 152.0.4191.52
  • Microsoft Microsoft Edge for Windows 152.0.4191.52

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-66798 updated cvss 8.8

cluster-backup-operator: cluster-backup-operator: Restore.spec.hooks passed verbatim to Velero Restore — arbitrary command execution in restored pods

  • Red Hat Advanced Cluster Management for Kubernetes 2.11 rhacm2/cluster-backup-rhel9-operator 1787684668
    fixed: vendor fix RHSA-2026:60387
  • Red Hat Advanced Cluster Management for Kubernetes 2.13 rhacm2/cluster-backup-rhel9-operator 1787259060
    fixed: vendor fix RHSA-2026:60390
  • Red Hat Advanced Cluster Management for Kubernetes 2.14 rhacm2/cluster-backup-rhel9-operator 1787183178
    fixed: vendor fix RHSA-2026:60388
  • Red Hat Advanced Cluster Management for Kubernetes 2.15 rhacm2/cluster-backup-rhel9-operator 1787238500
    fixed: vendor fix RHSA-2026:60389
  • Red Hat Advanced Cluster Management for Kubernetes 2.16 rhacm2/cluster-backup-rhel9-operator 1787183176
    fixed: vendor fix RHSA-2026:60391
  • Red Hat Advanced Cluster Management for Kubernetes 2.17 rhacm2/cluster-backup-rhel9-operator 1787227576
    fixed: vendor fix RHSA-2026:60386
  • Red Hat Advanced Cluster Management for Kubernetes 2.11 rhacm2/thanos-rhel9 1787685239, rhacm2/console-rhel9 1787687062, rhacm2/prometheus-rhel9 1787261499, rhacm2/acm-grafana-rhel9 1787682482, rhacm2/acm-search-v2-rhel9 1787688827, rhacm2/node-exporter-rhel9 1787263326, +34 more Red Hat Advanced Cluster Management for Kubernetes 2.13 rhacm2/thanos-rhel9 1787263906, rhacm2/acm-cli-rhel9 1787259085, rhacm2/console-rhel9 1787339249, rhacm2/prometheus-rhel9 1787263757, rhacm2/acm-grafana-rhel9 1787644958, rhacm2/acm-search-v2-rhel9 1787682112, +37 more Red Hat Advanced Cluster Management for Kubernetes 2.14 rhacm2/thanos-rhel9 1787614805, rhacm2/acm-cli-rhel9 1786923505, rhacm2/console-rhel9 1787339248, rhacm2/prometheus-rhel9 1786976997, rhacm2/acm-grafana-rhel9 1787645355, rhacm2/acm-search-v2-rhel9 1787682033, +37 more Red Hat Advanced Cluster Management for Kubernetes 2.15 rhacm2/thanos-rhel9 1787238739, rhacm2/acm-cli-rhel9 1787238522, rhacm2/console-rhel9 1787341780, rhacm2/prometheus-rhel9 1787238666, rhacm2/acm-grafana-rhel9 1787645007, rhacm2/acm-search-v2-rhel9 1787681674, +39 more Red Hat Advanced Cluster Management for Kubernetes 2.16 rhacm2/thanos-rhel9 1786909435, rhacm2/acm-cli-rhel9 1786908319, rhacm2/console-rhel9 1787339213, rhacm2/prometheus-rhel9 1786909036, rhacm2/acm-grafana-rhel9 1787645431, rhacm2/acm-search-v2-rhel9 1787681686, +40 more Red Hat Advanced Cluster Management for Kubernetes 2.17 rhacm2/thanos-rhel9 1787229716, rhacm2/acm-cli-rhel9 1787227626, rhacm2/console-rhel9 1787335105, rhacm2/prometheus-rhel9 1787230287, rhacm2/acm-grafana-rhel9 1787316467, rhacm2/acm-search-v2-rhel9 1787681651, +39 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2 mo ago

Exploit prediction

0.79% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.3 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
CNA 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Affected products

  • Microsoft Microsoft Edge (Chromium-based)
  • Microsoft Microsoft Edge for Android
  • Microsoft Microsoft Edge for iOS
  • Microsoft Microsoft Edge for Linux
  • Microsoft Microsoft Edge for MAC
  • Microsoft Microsoft Edge for Windows

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.