CVE-2026-62290
highpriority · track · 0OT risk · elevatedEPSS 0.001 · 1 %ileEUUSEPSS · scored 2026-10-28
cert-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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.7–7.3
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (6)
Products and version ranges known to be affected.
- linuxfoundation cert-manager1.18.0 → 1.19.6nvdUScpe:2.3:a:linuxfoundation:cert-manager:*:*:*:*:*:*:*:*
- linuxfoundation cert-manager1.20.0 → 1.20.3nvdUScpe:2.3:a:linuxfoundation:cert-manager:*:*:*:*:*:*:*:*
advisories (1)
Vendor and ecosystem advisories describing this.
- BIT-cert-manager-2026-62290cert-manager: Direct ACME Challenge resources can bypass Issuer DNS01 solver policy and use ClusterIssuer DNS credentials2026-07-27vendor · osvUS
cert-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.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (21)
External citations — patches, advisories, analysis.
- https://github.com/cert-manager/cert-manager/commit/6bda47297c8fbc6b121b8b76624b668d26f1a155cnnvd
- https://github.com/cert-manager/cert-manager/commit/b37dbf01ecea50a0b3a19df0a7fe4c5ad6803f16cnnvd
- https://github.com/cert-manager/cert-manager/pull/8940cnnvd
- https://github.com/cert-manager/cert-manager/pull/8941cnnvd
- https://github.com/cert-manager/cert-manager/releases/tag/v1.19.6cnnvd
- https://github.com/cert-manager/cert-manager/releases/tag/v1.20.3cnnvd
- https://github.com/cert-manager/cert-manager/security/advisories/GHSA-8rvj-mm4h-c258cnnvd
- https://github.com/cert-manager/cert-manager/commit/6bda47297c8fbc6b121b8b76624b668d26f1a155enisa_euvd
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