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Vulnerability record · CVE-2026-62290 · published 16 July 2026

CVE-2026-62290: Linuxfoundation cert-manager incorrect authorization vulnerability

Linuxfoundation · Cert Manager

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.

7.3 CVSS 3.1 High EPSS 0.11% · top 98.7% CWE-863 · Incorrect authorization
7.3CVSS 3.1 base score
0.11%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References, 2 tagged exploit
30 Jul 2026Last modified by NVD

Description

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/cert-manager/cert-manager/commit/6bda47297c8fbc6b121b8b76624b668d26f1a155 Patch
https://github.com/cert-manager/cert-manager/commit/b37dbf01ecea50a0b3a19df0a7fe4c5ad6803f16 Patch
https://github.com/cert-manager/cert-manager/pull/8940 Issue TrackingPatch
https://github.com/cert-manager/cert-manager/pull/8941 Issue TrackingPatch
https://github.com/cert-manager/cert-manager/releases/tag/v1.19.6 ProductRelease Notes
https://github.com/cert-manager/cert-manager/releases/tag/v1.20.3 ProductRelease Notes
https://github.com/cert-manager/cert-manager/security/advisories/GHSA-8rvj-mm4h-c258 ExploitMitigationVendor Advisory
https://github.com/cert-manager/cert-manager/security/advisories/GHSA-8rvj-mm4h-c258 ExploitMitigationVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-62290), CISA KEV, FIRST EPSS (scores of 2026-09-25). This page is refreshed as NVD updates the record.