CVE-2026-100706
kyverno before 1.19.1 Privilege Escalation via Policy apiCall urlPath
CVSS Score
9.9
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-441 |
| Vendor | kyverno |
| Product | kyverno |
| Published | Sep 26, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
kyverno / kyverno
0 < 1.19.1
References
Credits
cherez0ff