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CVE-2026-32236

NONE EPSS 0.04%
Updated Mar 12, 2026
Backstage
Parameter Value
Type CWE-918 (Server-Side Request Forgery (SSRF))
Vendor Backstage
Public PoC No

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.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
None
No disruption

CVSS Vector v3.1

Weakness Type (CWE)

CWE-918 Server-Side Request Forgery (SSRF)

References 2

https://github.com/backstage/backstage/commit/17038abf2dfdb4abc08a59b1c95af3985…
security-advisories@github.com
https://github.com/backstage/backstage/security/advisories/GHSA-qp4c-xg64-7c6x
security-advisories@github.com
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