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CVE-2026-100706— kyverno before 1.19.1 Privilege Escalation via Policy apiCall urlPath

Quick assessment

Affected
kyverno kyverno
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Kyverno 1.19.1 之前的版本中，Policy 的 apiCall urlPath 未能正确验证 URL 编码的路径段，允许命名空间租户绕过每个命名空间的限制，并以 admission-controller ServiceAccount 的身份在其他命名空间中创建对象。攻击者可以通过使用百分号编码的路径遍历序列来利用此漏洞，从而在全集群范围内创建 MutatingWebhookConfiguration 对象或在 kyverno 命名空间中创建 PolicyException 对象，进而实现权限提升至

CVSS 9.9 · Critical EPSS 0.61% · P47
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I. Basic Information for CVE-2026-100706

Vulnerability Information
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Vulnerability Title
kyverno before 1.19.1 Privilege Escalation via Policy apiCall urlPath
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未有动机的代理或中间人(混淆代理)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
kyverno kyverno 0 ~ 1.19.1 -

II. Public POCs for CVE-2026-100706

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III. Intelligence Information for CVE-2026-100706

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Other References for CVE-2026-100706 (1)

Other References for CVE-2026-100706 (1)

Same Patch Batch · kyverno · 2026-09-26 · 5 CVEs total

CVE-2026-100704 7.7 HIGH Kyverno before 1.19.1 ImageValidatingPolicy Exception Bypass
CVE-2026-100707 7.7 HIGH Kyverno before 1.19.1 Namespace Isolation Bypass via Percent-Encoded Path
CVE-2026-100703 7.7 HIGH Kyverno before 1.19.1 Cross-Namespace Data Access via globalcontext.Lib
CVE-2026-100705 7.6 HIGH Kyverno before 1.19.1 SSRF via legacy apiCall service executor

IV. Related Vulnerabilities

Same product: kyverno
Same vendor: kyverno
Same weakness: CWE-441

V. Comments for CVE-2026-100706

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