Unintended Proxy or Intermediary ('Confused Deputy') Affecting github.com/kyverno/kyverno/pkg/background/mpol package, versions <1.17.0
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMKYVERNOKYVERNOPKGBACKGROUNDMPOL-16069018
- published15 Apr 2026
- disclosed14 Apr 2026
- creditOleh Konko
Introduced: 14 Apr 2026
CVE-2026-40868 Â (opens in a new tab)How to fix?
Upgrade github.com/kyverno/kyverno/pkg/background/mpol to version 1.17.0 or higher.
Overview
Affected versions of this package are vulnerable to Unintended Proxy or Intermediary ('Confused Deputy') via the apiCall servicecall helper. An attacker can obtain sensitive service account tokens by crafting a policy that triggers an outbound request without an explicit Authorization header, causing the token to be injected and sent to an attacker-controlled endpoint. This is only exploitable if the attacker can create or update a ClusterPolicy or GlobalContextEntry that controls the request URL and headers.
Workaround
This vulnerability can be mitigated by setting an explicit Authorization header in servicecall policies or avoiding the use of servicecall to arbitrary URLs in policies.