{"id":"EUVD-2026-58177","enisaUuid":"85ddf39f-89cb-3f23-bf45-529ca517a6d4","description":"Backstage is an open framework for building developer portals. Prior to 0.29.2, the experimental dynamic client registration and client ID metadata document features in the @backstage/plugin-auth-backend use full-string matcher.isMatch glob matching for auth.experimentalDynamicClientRegistration.allowedRedirectUriPatterns and the auth.experimentalClientIdMetadataDocuments allowedClientIdPatterns and allowedRedirectUriPatterns options. A hostname wildcard can match across URL component boundaries, allowing an attacker-controlled redirect URI with a trusted hostname suffix in its path to pass the allowlist and receive an OAuth authorization code after a victim completes the flow. Patterns without an explicit protocol can match unintended protocols, and redirect URIs containing embedded credentials are accepted after user information is stripped for matching. The features are experimental and disabled by default; only deployments that enable them and configure custom wildcard-hostname or protocol-less patterns are affected. This issue is first fixed in prerelease version 0.29.2.","datePublished":"Aug 13, 2026, 5:32:39 PM","dateUpdated":"Aug 13, 2026, 6:07:45 PM","baseScore":4.7,"baseScoreVersion":"3.1","baseScoreVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N","references":"https://github.com/backstage/backstage/security/advisories/GHSA-38hq-7x33-php4\n","aliases":"CVE-2026-73563\nGHSA-38hq-7x33-php4\n","assigner":"GitHub_M","epss":0.17,"enisaIdProduct":[{"id":"247084d8-3a06-395f-b754-2ed89191b72b","product":{"name":"backstage","vendor":{"name":"backstage"}},"product_version":"\u003c 0.29.2"}],"enisaIdVendor":[{"id":"499f342e-5ed8-3525-8c81-f098d1c9b49b","vendor":{"name":"backstage"}}],"enisaIdVulnerability":[{"id":"19685ca4-b5db-354d-a1bb-27c5ae71a3bd","vulnerability":{"id":"GHSA-38hq-7x33-php4","description":"@backstage/plugin-auth-backend: Unauthenticated OAuth account takeover via `redirect_uri` allowlist bypass","datePublished":"Jul 24, 2026, 4:20:59 PM","dateUpdated":"Aug 13, 2026, 5:32:47 PM","baseScore":0.0,"references":"https://github.com/backstage/backstage/security/advisories/GHSA-38hq-7x33-php4\nhttps://github.com/backstage/backstage/commit/274acc51d22a7dd919cdda49d9086cf12c0b8711\nhttps://github.com/backstage/backstage/commit/6370e53bce8b227c63092300594ffde29c006886\nhttps://github.com/backstage/backstage/commit/ef606a85545cb6d765e20afd1ff43ae5407a3660\nhttps://github.com/backstage/backstage/commit/fdc0d2dcd9a571e3839d7f5de4133c4e242a3a41\nhttps://github.com/backstage/backstage\nhttps://github.com/backstage/backstage/releases/tag/v1.53.0\n","enisa_id":"EUVD-2026-58177\n","aliases":"CVE-2026-73563\nGHSA-38hq-7x33-php4\n","epss":0.0,"dataProcessed":"Oct 25, 2026, 1:58:26 AM","vulnerabilityProduct":[],"vulnerabilityVendor":[]}},{"id":"47e8265b-9a05-3f3a-ad75-8b1d683f86ae","vulnerability":{"id":"CVE-2026-73563","description":"Backstage is an open framework for building developer portals. Prior to 0.29.2, the experimental dynamic client registration and client ID metadata document features in the @backstage/plugin-auth-backend use full-string matcher.isMatch glob matching for auth.experimentalDynamicClientRegistration.allowedRedirectUriPatterns and the auth.experimentalClientIdMetadataDocuments allowedClientIdPatterns and allowedRedirectUriPatterns options. A hostname wildcard can match across URL component boundaries, allowing an attacker-controlled redirect URI with a trusted hostname suffix in its path to pass the allowlist and receive an OAuth authorization code after a victim completes the flow. Patterns without an explicit protocol can match unintended protocols, and redirect URIs containing embedded credentials are accepted after user information is stripped for matching. The features are experimental and disabled by default; only deployments that enable them and configure custom wildcard-hostname or protocol-less patterns are affected. This issue is first fixed in prerelease version 0.29.2.","datePublished":"Aug 13, 2026, 5:32:39 PM","dateUpdated":"Aug 13, 2026, 6:07:45 PM","status":"PUBLISHED","baseScore":4.7,"baseScoreVersion":"3.1","baseScoreVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N","references":"https://github.com/backstage/backstage/security/advisories/GHSA-38hq-7x33-php4\n","enisa_id":"EUVD-2026-58177\n","assigner":"GitHub_M","epss":0.17,"dataProcessed":"Oct 28, 2026, 7:14:15 AM","vulnerabilityProduct":[{"id":"8fcf6f75-2304-3c5e-b5fa-c945aba8e329","product":{"name":"backstage","vendor":{"name":"backstage"}},"product_version":"\u003c 0.29.2"}],"vulnerabilityVendor":[{"id":"b4e42156-5eff-3677-b21d-5d7ce8016724","vendor":{"name":"backstage"}}]}}],"enisaIdAdvisory":[{"id":"73307d43-77ea-37c9-8abe-c29ecd55d237","advisory":{"id":"RHSA-2026:65155","description":"Red Hat Security Advisory: Ansible plug-ins for Red Hat Developer Hub Product Release Update","summary":"Updated images are now available for Red Hat Ansible Automation Platform 2.2, which include new features, bug fixes, and enhancements for Red Hat Ansible Automation Platform integration with Red Hat Developer Hub.","datePublished":"Sep 8, 2026, 8:56:15 AM","dateUpdated":"Oct 23, 2026, 9:28:34 PM","baseScore":0.0,"references":"https://access.redhat.com/errata/RHSA-2026:65155\nhttps://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_65155.json\n","aliases":"CVE-2026-67213\nCVE-2026-67214\nCVE-2026-73563\nCVE-2026-73566\nCVE-2026-75838\nCVE-2026-75899\nCVE-2026-75931\nCVE-2026-75975\nCVE-2026-76172\nCVE-2026-84292\nCVE-2026-84394\n","source":{"id":9,"name":"csaf_redhat"},"advisoryProduct":[{"id":"3d4bbb64-401b-3f2f-af7f-15587e4d456a","product":{"name":"Red Hat Ansible Automation Platform 2.2","vendor":{"name":"Red Hat"}}},{"id":"ce995a76-06ed-3a98-a154-9f799828a805","product":{"name":"registry.redhat.io/ansible-automation-platform/automation-portal@sha256:60327d55eb419b955cea0d2d0693d820fe31040a006a38146aa524240528afff_amd64","vendor":{"name":"Red Hat"}}}]}},{"id":"f575995b-ca22-39c6-8ef1-2bc94e4ff8d3","advisory":{"id":"RHSA-2026:65118","description":"Red Hat Security Advisory: Ansible plug-ins for Red Hat Developer Hub Product Release Update","summary":"Updated images are now available for Red Hat Ansible Automation Platform 2.1, which include new features, bug fixes, and enhancements for Red Hat Ansible Automation Platform integration with Red Hat Developer Hub.","datePublished":"Sep 8, 2026, 7:34:17 AM","dateUpdated":"Oct 23, 2026, 9:28:32 PM","baseScore":0.0,"references":"https://access.redhat.com/errata/RHSA-2026:65118\nhttps://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_65118.json\n","aliases":"CVE-2026-5079\nCVE-2026-67213\nCVE-2026-67214\nCVE-2026-67313\nCVE-2026-67314\nCVE-2026-67320\nCVE-2026-67321\nCVE-2026-73563\nCVE-2026-73566\nCVE-2026-75838\nCVE-2026-75899\nCVE-2026-75931\nCVE-2026-75975\nCVE-2026-76172\nCVE-2026-84292\nCVE-2026-84394\n","source":{"id":9,"name":"csaf_redhat"},"advisoryProduct":[{"id":"612b8395-6c91-3cd7-8dcd-4ff6a0fe11f1","product":{"name":"Red Hat Ansible Automation Platform 2.1","vendor":{"name":"Red Hat"}}},{"id":"cf281ae3-c068-3953-8bff-6a1d551008a0","product":{"name":"registry.redhat.io/ansible-automation-platform/automation-portal@sha256:7145c54b94927bc64e9def7a47cb43b7706ee21d41f8dd97a08ea8ff1fcad65e_amd64","vendor":{"name":"Red Hat"}}}]}}]}