Kyverno before 1.18.0 contains a server-side request forgery vulnerability in apiCall.service.url that allows authenticated users to send arbitrary HTTP requests by injecting user-controlled input through variable substitution. Attackers can target internal services, cloud metadata endpoints, and loopback addresses, with response data reflected in admission error messages enabling non-blind data exfiltration.
https://www.vulncheck.com/advisories/kyverno-before-1.18.0-server-side-request-forgery-via-apicall
https://github.com/kyverno/kyverno/security/advisories/GHSA-qr4g-8hrp-c4rw
Published: 2026-09-01
Updated: 2026-09-10
Base Score: 6.8
Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:N/A:N
Severity: Medium
Base Score: 7.7
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Severity: High
Base Score: 8.3
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
Severity: High
EPSS: 0.00263