SSRF in Kyverno
CVE-2026-84199
Kyverno before 1.16.2 contains a server-side request forgery (SSRF) vulnerability in the APICall feature. The URL field in a Policy's ServiceCall configuration is not validated, so a user with namespace-level Policy creation permissions can direct Kyverno to make HTTP requests to arbitrary internal resources (e.g., cloud metadata endpoints such as 169.254.169.254 or other tenants' resources). Because Kyverno executes these requests using its cluster-wide high-privilege ServiceAccount (a Confused Deputy problem), the responses—potentially including other tenants' secrets and cloud IAM credentials—are returned in the PolicyReport and can be read by the attacker, breaking multi-tenant isolation.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (27.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 27.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/kyverno/kyverno/security/advisories/GHSA-fmqp-4wfc-w3v7 (vendor-advisory)
- www.vulncheck.com/advisories/kyverno-before-1.16.2-ssrf-via-apicall-feature (third-party-advisory)
Frequently asked questions
- What is CVE-2026-84199?
- CVE-2026-84199 is a high-severity vulnerability in Kyverno, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.7/10. Published 2026-09-01.
- How severe is CVE-2026-84199?
- High severity. CVSS v3 base score is 7.7 out of 10.