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Advisory record · GHSA-fmqp-4wfc-w3v7

Kyverno APICall SSRF Vulnerability Leading to Multi-Tenant Isolation Breach

CVSS 6.9 MediumEPSS 0.0036 · 29th percentile

Published by the GitHub Advisory Database at 14 Apr 2026, 20:06 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/kyverno/kyvernoGo<1.16.21.16.2
Identifiers
GHSA-fmqp-4wfc-w3v7 · BIT-kyverno-2026-84199 · CVE-2026-84199 · GO-2026-5371
Weakness (CWE)
CWE-918
Tags
Published
14 Apr 2026
Updated
14 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Kyverno versions before 1.16.2 contain a server-side request forgery flaw in the APICall feature, which fetches external data for policies without validating target URLs. A user who can create Policies, without cluster-admin rights, can make Kyverno's high-privilege ServiceAccount send requests to internal addresses, potentially reading other tenants' Secrets or cloud metadata credentials. Upgrade to Kyverno 1.16.2 or later.

Written 1 Nov 2026.

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

ScoreRatingCVSSVectorSource
6.9 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0036, the 29th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:12 UTC First seen by agentprime
  2. 31 Oct 2026, 14:12 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.