Backstage is an open framework for building developer portals. Prior to 0.27.1, a Server-Side Request Forgery (SSRF) vulnerability exists in @backstage/plugin-auth-backend when auth.experimentalClientIdMetadataDocuments.enabled is set to true. The CIMD
metadata fetch validates the initial client_id hostname against private IP ranges but does not apply the same validation after HTTP redirects. The practical impact is limited. The attacker cannot read the response body from the internal request, cannot control request headers or method, and the feature must be explicitly enabled via an experimental flag that is off by default. Deployments that restrict allowedClientIdPatterns to specific trusted domains are not affected. Patched in @backstage/plugin-auth-backend version 0.27.1.
Metrics
Affected Vendors & Products
References
History
Thu, 12 Mar 2026 21:15:00 +0000
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ssvc
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Thu, 12 Mar 2026 19:00:00 +0000
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| Description | Backstage is an open framework for building developer portals. Prior to 0.27.1, a Server-Side Request Forgery (SSRF) vulnerability exists in @backstage/plugin-auth-backend when auth.experimentalClientIdMetadataDocuments.enabled is set to true. The CIMD metadata fetch validates the initial client_id hostname against private IP ranges but does not apply the same validation after HTTP redirects. The practical impact is limited. The attacker cannot read the response body from the internal request, cannot control request headers or method, and the feature must be explicitly enabled via an experimental flag that is off by default. Deployments that restrict allowedClientIdPatterns to specific trusted domains are not affected. Patched in @backstage/plugin-auth-backend version 0.27.1. | |
| Title | @backstage/plugin-auth-backend: SSRF in experimental CIMD metadata fetch | |
| Weaknesses | CWE-918 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-03-12T20:46:40.754Z
Reserved: 2026-03-11T14:47:05.683Z
Link: CVE-2026-32236
Updated: 2026-03-12T20:38:13.637Z
Status : Awaiting Analysis
Published: 2026-03-12T19:16:18.867
Modified: 2026-03-12T21:07:53.427
Link: CVE-2026-32236
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OpenCVE Enrichment
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