Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Kyverno versions before 1.17.0 are affected. When a ClusterPolicy or global context entry uses the apiCall servicecall helper without setting its own Authorization header, Kyverno automatically attaches its controller serviceaccount token to the request. An attacker who can create or update such a policy can point the URL at an endpoint they control and receive that token, with privileges depending on the RBAC bound to the serviceaccount. Upgrade to Kyverno 1.17.0 or later. As a workaround, set an explicit Authorization header in servicecall policies or avoid servicecall to arbitrary URLs.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 8.1 | High | 3.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0029, the 21st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:13 UTC First seen by agentprime
- 31 Oct 2026, 14:13 UTC Confirmed by OSV