High 7.3Published Jul 16, 2026

CVE-2026-62290cert-manager: Direct ACME Challenge resources can bypass Issuer DNS01 solver policy and use ClusterIssuer DNS credentials

Updated under an hour ago (Oct 28, 2026, 5:00 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 7.3 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
Weakness (CWE): CWE-863
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jul 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

cert-manager cert-manager cert_manager:cert_manager (from the name)	from 1.18.0, < 1.19.6; from 1.20.0, < 1.20.3	CNA record
linuxfoundation cert-manager linuxfoundation:cert-manager	from 1.18.0 before 1.19.6; from 1.20.0 before 1.20.3	NVD

References

References

https://github.com/cert-manager/cert-manager/security/advisories/GHSA-8rvj-mm4h-c258	x-refsource-confirm, exploit, mitigation, vendor-advisory
https://github.com/cert-manager/cert-manager/pull/8940	x-refsource-misc, issue-tracking, patch
https://github.com/cert-manager/cert-manager/pull/8941	x-refsource-misc, issue-tracking, patch
https://github.com/cert-manager/cert-manager/commit/6bda47297c8fbc6b121b8b76624b668d26f1a155	x-refsource-misc, patch
https://github.com/cert-manager/cert-manager/commit/b37dbf01ecea50a0b3a19df0a7fe4c5ad6803f16	x-refsource-misc, patch
https://github.com/cert-manager/cert-manager/releases/tag/v1.19.6	x-refsource-misc, product, release-notes
https://github.com/cert-manager/cert-manager/releases/tag/v1.20.3	x-refsource-misc, product, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.