CVE-2026-84200CWE-284broken-access-control

CVE-2026-84200

Critical · published September 1, 2026

CVSS v3.1
9.0
EPSS
0%
Percentile
18.7
In the wild
Unconfirmed
What it is

Kyverno versions v1.9.0 through v1.12.7 contain a policy exception handling flaw. When a policy in enforce mode is combined with two PolicyExceptions, the less restrictive exception takes precedence, allowing an attacker to bypass the policy by crafting a resource name that matches the second exception's name pattern (e.g., '*ingress*'). This can be used to circumvent policies such as one blocking hostPath volumes. Fixed in v1.13.0.

The record
Technical detail
CVSS v3.1
9.0 · CRITICAL
Vector
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
9.4 · CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
EPSS
0.00273 · 18.7th percentile
Weakness
CWE-284 · Improper Access Control
Published
2026-09-01T16:17Z
References (3)
https://github.com/kyverno/kyverno/security/advisories/GHSA-gg4x-fgg2-h9w9 · [email protected]https://www.vulncheck.com/advisories/kyverno-before-1.13.0-policy-bypass-via-multiple-exceptions · [email protected]https://github.com/kyverno/kyverno/security/advisories/GHSA-gg4x-fgg2-h9w9 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 03 SEP 03:32Z
    EPSS moved — → 0%
    epss
  • 01 SEP 11:34Z
    Kyverno before v1.13.0 Policy Bypass via Multiple Exceptions
    cvelistv5