TI-2026-24765 Aliases CVE-2026-32236 GHSA-qp4c-xg64-7c6x

@backstage/plugin-auth-backend: SSRF in experimental CIMD metadata fetch

LOW 10CWE-918Published 2026-03-12 · Updated 2026-04-15

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: Present
Impact type: —
Confidentiality · integrity · availability: None · Low · None
Fix status: Partial Red Hat: 2 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00343 27th percentileScored 2026-11-07

Fix Partial plugin-auth-backend (@backstage): 0.27.1@backstage/plugin-auth-backend (npm): 0.27.1Red Hat: 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
backstage	plugin-auth-backend	before 0.27.1	0.27.1	Patch available	CNA
—	@backstage/plugin-auth-backend (npm)	before 0.27.1	0.27.1	Patch available	GHSA-qp4c-xg64-7c6x

plugin-auth-backend Vendorbackstage Affected before 0.27.1 Fixed in 0.27.1 Patch available CNA
@backstage/plugin-auth-backend (npm) Vendor— Affected before 0.27.1 Fixed in 0.27.1 Patch available GHSA-qp4c-xg64-7c6x

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:linuxfoundation:backstage::::::::	up to 0.27.0	Vulnerable	backstage

cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:* Versions up to 0.27.0 Vulnerable ·backstage

Remediation

Fix · CNA plugin-auth-backend (@backstage) Fixed in 0.27.1
Fix · GHSA-qp4c-xg64-7c6x @backstage/plugin-auth-backend (npm) Fixed in 0.27.1 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Developer Hub 1	Affected	No fix yet: Fix deferred
Self-service automation portal 2	Affected	No fix yet: Fix deferred

Timeline

2026-10-02 Threatist record created from CVE-2026-32236
2026-10-03 Alias added: GHSA-qp4c-xg64-7c6x
2026-10-27 Affected versions changed · Red Hat

References

Patch 1

https://github.com/backstage/backstage/commit/17038abf2dfdb4abc08a59b1c95af39851de0e07

Advisory 2

Other 1

https://github.com/backstage/backstage

TI-2023-17988 Insecure sandbox in Backstage Scaffolder plugin CVSS 3.1CRITICAL 9.9
TI-2026-69075 Sensitive information exposure in Backstage Scaffolder CVSS 3.1CRITICAL 9.6
TI-2026-69061 Path traversal in Backstage Bitbucket pull-request scaffolder actions CVSS 3.1CRITICAL 9.9
TI-2026-60083 Backstage: Improper input validation in TechDocs MkDocs configuration CVSS 3.1HIGH 8.8
TI-2026-69165 Backstage TechDocs config flaw allows code execution CVSS 3.1HIGH 8.8
TI-2026-69083 Code injection via MkDocs theme configuration in Backstage TechDocs CVSS 3.1HIGH 8.8

See all 52 →

Sources

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