MEDIUM

CVE-2026-66798

CVSS v3

4.3

MEDIUM

EPSS Score

0.8 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

CVE-2026-66798 Red Hat Product Security24 products fixed
cluster-backup-operator: cluster-backup-operator: Restore.spec.hooks passed verbatim to Velero Restore — arbitrary command execution in restored pods
RHSA-2026:60391 Red Hat Product Security4 products fixed
Red Hat Security Advisory: Red Hat Advanced Cluster Management for Kubernetes v2.16.4 security update
RHSA-2026:60390 Red Hat Product Security4 products fixed
Red Hat Security Advisory: Red Hat Advanced Cluster Management for Kubernetes v2.13.11 security update
RHSA-2026:60388 Red Hat Product Security4 products fixed
Red Hat Security Advisory: Red Hat Advanced Cluster Management for Kubernetes v2.14.4 security update
RHSA-2026:60389 Red Hat Product Security4 products fixed
Red Hat Security Advisory: Red Hat Advanced Cluster Management for Kubernetes v2.15.6 security update
RHSA-2026:60387 Red Hat Product Security4 products fixed
Red Hat Security Advisory: Red Hat Advanced Cluster Management for Kubernetes v2.11.11 security update

1 more advisory

Full record on NVD

Description

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

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Published: 2026-08-28
Last Modified: 2026-08-29

Frequently asked questions

What is CVE-2026-66798?

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

Is CVE-2026-66798 actively exploited?

Active exploitation of CVE-2026-66798 has not been confirmed. Its EPSS score was 0.8% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-66798?

CVE-2026-66798 has a CVSS v3 base score of 4.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L.

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