HIGH

CVE-2026-66808

CVSS v3

8.8

HIGH

EPSS Score

2.0 %

exploit probability, as of 2026-10-18

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-2026-66808 Red Hat Product Security24 products fixed
hypershift-addon-operator: Unsanitized hub ConfigMap data passed as CLI arguments to privileged install Job (Argument Injection)
RHSA-2026:59593 Red Hat Product Security4 products fixed
Red Hat Security Advisory: multicluster engine for Kubernetes v2.17.2 security update
RHSA-2026:59579 Red Hat Product Security4 products fixed
Red Hat Security Advisory: multicluster engine for Kubernetes v2.6.14 security update
RHSA-2026:59559 Red Hat Product Security4 products fixed
Red Hat Security Advisory: multicluster engine for Kubernetes v2.9.7 security update
RHSA-2026:59558 Red Hat Product Security4 products fixed
Red Hat Security Advisory: multicluster engine for Kubernetes v2.8.10 security update
RHSA-2026:57194 Red Hat Product Security4 products fixed
Red Hat Security Advisory: multicluster engine for Kubernetes v2.11.5 security update

1 more advisory

Full record on NVD

Description

Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published: 2026-08-11
Last Modified: 2026-08-12

Frequently asked questions

What is CVE-2026-66808?

Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

Is CVE-2026-66808 actively exploited?

Active exploitation of CVE-2026-66808 has not been confirmed. Its EPSS score was 2.0% on 2026-10-18, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-66808?

CVE-2026-66808 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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