cert-manager: Direct ACME Challenge resources can bypass Issuer DNS01 solver policy and use ClusterIssuer DNS credentials

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Summary

CVECVE-2026-62290
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-16 20:16:46 UTC
Updated2026-07-16 20:16:46 UTC
Descriptioncert-manager adds certificates and certificate issuers as resource types in Kubernetes clusters, and simplifies the process of obtaining, renewing and using those certificates. From 1.18.0 until 1.19.6 and 1.20.3, Challenge resources under acme.cert-manager.io can be created directly by namespace users without admission validation tying the Challenge to an Order, owner reference, or Issuer-selected solver, allowing attacker-controlled Challenge.spec.solver values referencing a ClusterIssuer to bypass DNS01 solver selectors such as dnsZones, dnsNames, and matchLabels and cause cert-manager to use ClusterIssuer DNS credentials for attacker-selected provider settings and DNS names, including disclosure of X-Api-User and X-Api-Key headers for acme-dns. This issue is fixed in versions 1.19.6 and 1.20.3.

Risk And Classification

Primary CVSS: v3.1 7.3 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

Problem Types: CWE-863 | CWE-863 CWE-863: Incorrect Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.3HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
3.1CNADECLARED7.3HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
Low
Availability
None

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Cert-manager Cert-manager affected >= 1.18.0, < 1.19.6 Not specified
CNA Cert-manager Cert-manager affected >= 1.20.0, < 1.20.3 Not specified

References

ReferenceSourceLinkTags
github.com/cert-manager/cert-manager/pull/8940 [email protected] github.com
github.com/cert-manager/cert-manager/releases/tag/v1.20.3 [email protected] github.com
github.com/cert-manager/cert-manager/releases/tag/v1.19.6 [email protected] github.com
github.com/cert-manager/cert-manager/commit/b37dbf01ecea50a0b3a19df0a7fe... [email protected] github.com
github.com/cert-manager/cert-manager/commit/6bda47297c8fbc6b121b8b76624b... [email protected] github.com
github.com/cert-manager/cert-manager/security/advisories/GHSA-8rvj-mm4h-... [email protected] github.com
github.com/cert-manager/cert-manager/pull/8941 [email protected] github.com
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