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CVE

CVE-2026-100706

kyverno before 1.19.1 Privilege Escalation via Policy apiCall urlPath
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CVE

CVE-2026-100706

kyverno before 1.19.1 Privilege Escalation via Policy apiCall urlPath

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.4
-
4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
9.9
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100706.json, https://github.com/kyverno/kyverno/security/advisories/GHSA-5qq8-67g6-4h2w, https://nvd.nist.gov/vuln/detail/CVE-2026-100706, https://www.vulncheck.com/advisories/kyverno-before-1.19.1-privilege-escalation-via-policy-apicall-urlpath

Severity

9.9

CVSS Score
0
10

Basic Information

Base CVSS
9.9
EPSS Probability
0.00613%
EPSS Percentile
0.48347%
Introduced Version
0,v1.10.1-rc.1,v1.5.0-rc1.0.20230626133140-e5ceebe4a924,v1.10.0-alpha.1,v1.5.0-rc1.0.20221227083649-787a1dc40a98,v1.3.2-rc2,v1.3.2-rc1.0.20210201205913-e8e3b93a5f28
Fix Available
40ec788d48bb28d83dbf85538e962a59db9d45c6,v1.19.1-rc.1,v1.19.1-0.20260826073954-d198b2a8ec9d

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