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CVE-2026-32236— @backstage/plugin-auth-backend: SSRF in experimental CIMD metadata fetch

Quick assessment

Affected
@backstage plugin-auth-backend
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Backstage是Backstage开源的一个应用软件。后台是一个开放的平台，用于构建开发者门户。 Backstage 0.27.1之前版本存在代码问题漏洞，该漏洞源于启用实验性客户端ID元数据文档功能时存在服务端请求伪造，可能导致内部请求。

AI Predicted 3.3 Difficulty: Moderate EPSS 0.29% · P22
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I. Basic Information for CVE-2026-32236

Vulnerability Information
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Vulnerability Title
@backstage/plugin-auth-backend: SSRF in experimental CIMD metadata fetch
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Backstage 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Backstage是Backstage开源的一个应用软件。后台是一个开放的平台，用于构建开发者门户。 Backstage 0.27.1之前版本存在代码问题漏洞，该漏洞源于启用实验性客户端ID元数据文档功能时存在服务端请求伪造，可能导致内部请求。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
@backstage plugin-auth-backend < 0.27.1 -

II. Public POCs for CVE-2026-32236

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III. Intelligence Information for CVE-2026-32236

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Patches & Fixes for CVE-2026-32236 (1)

Vendor Advisories for CVE-2026-32236 (1)

Same Patch Batch · @backstage · 2026-03-12 · 3 CVEs total

CVE-2026-32235 5.9 MEDIUM @backstage/plugin-auth-backend: OAuth redirect URI allowlist bypass
CVE-2026-32237 4.4 MEDIUM @backstage/plugin-scaffolder-backend: Possible exposure of defaultEnvironment secrets usin

IV. Related Vulnerabilities

Same product: plugin-auth-backend
Same vendor: @backstage
Same weakness: CWE-918

V. Comments for CVE-2026-32236

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