How severe is CVE-2026-100706?

CVE-2026-100706 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-100706 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-100706?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2026-100706 published?

CVE-2026-100706 was published on 2026-09-26 and last updated on 2026-09-28.

CVE-2026-100706

CVE-2026-100706 is a critical-severity vulnerability with a CVSS 3.x base score of 9.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-441.

Key facts

Severity: Critical (CVSS 3.x base score 9.9)
CVSS v4: 9.4
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-441
Published: 2026-09-26
Last modified: 2026-09-28

Description

kyverno before 1.19.1 fails to properly validate URL-encoded path segments in Policy apiCall urlPath, allowing namespace tenants to bypass the per-namespace clamp and create objects in other namespaces as the admission-controller ServiceAccount. Attackers can exploit this by using percent-encoded directory traversal sequences to create MutatingWebhookConfiguration objects cluster-wide or PolicyException objects in the kyverno namespace, enabling privilege escalation to cluster admin.

Frequently asked questions

What is CVE-2026-100706?: kyverno before 1.19.1 fails to properly validate URL-encoded path segments in Policy apiCall urlPath, allowing namespace tenants to bypass the per-namespace clamp and create objects in other namespaces as the admission-controller ServiceAccount. Attackers can exploit this by using percent-encoded directory traversal sequences to create MutatingWebhookConfiguration objects cluster-wide or PolicyException objects in the kyverno namespace, enabling privilege escalation to cluster admin.
How severe is CVE-2026-100706?: CVE-2026-100706 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-100706 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-100706?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2026-100706 published?: CVE-2026-100706 was published on 2026-09-26 and last updated on 2026-09-28.

References

Other CWE-441 vulnerabilities

CVE-2026-69399 — Critical (CVSS 10.0): Azure Arc Elevation of Privilege Vulnerability
CVE-2026-83548 — Critical (CVSS 10.0): A Pre-authentication SSRF vulnerability exists in the SMA1000 Appliance Work Place interface due to an unintended…
CVE-2026-42933 — Critical (CVSS 10.0): Pronetiqs IntraVUE versions 3.2.1a14 and prior have an unintended proxy or intermediary vulnerability which could allow…
CVE-2026-39906 — Critical (CVSS 10.0): Unisys WebPerfect Image Suite versions 3.0.3960.22810 and 3.0.3960.22604 expose a deprecated .NET Remoting TCP channel…
CVE-2026-67567 — Critical (CVSS 9.9): A flaw was found in the multicloud-operators-subscription component. This vulnerability allows a tenant, who has the…
CVE-2026-72526 — Critical (CVSS 9.9): A flaw was found in the multicloud-integrations component. The Application propagation controller processes the…

Browse all CWE-441 vulnerabilities →