CVE-2026-100706
kyverno before 1.19.1 Privilege Escalation via Policy apiCall urlPath
- State
- Published
- Severity
- 9.4 Critical
- Published
- Sep 26, 2026
- Updated
- Sep 26, 2026
- Reserved
- Sep 26, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.4 Critical | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H | VulnCheck |
| 3.1 | 9.9 Critical | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-441 Unintended Proxy or Intermediary ('Confused Deputy')
Affected Products
| Product | Versions |
|---|---|
kyvernokyverno |
|
References
- GitHub Security Advisory (GHSA-5qq8-67g6-4h2w)vendor-advisory
- VulnCheck Advisory: kyverno before 1.19.1 Privilege Escalation via Policy apiCall urlPaththird-party-advisory
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.