CVE-2026-32235— @backstage/plugin-auth-backend: OAuth redirect URI allowlist bypass
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之前版本存在输入验证错误漏洞，该漏洞源于实验性OIDC提供程序存在重定向URI允许列表绕过，可能导致授权码泄露给攻击者。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-32235
Vulnerability Information
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Vulnerability Title
@backstage/plugin-auth-backend: OAuth redirect URI allowlist bypass
Source: CVE Program / CVE List V5
Vulnerability Description
Backstage is an open framework for building developer portals. Prior to 0.27.1, the experimental OIDC provider in @backstage/plugin-auth-backend is vulnerable to a redirect URI allowlist bypass. Instances that have enabled experimental Dynamic Client Registration or Client ID Metadata Documents and configured allowedRedirectUriPatterns are affected. A specially crafted redirect URI can pass the allowlist validation while resolving to an attacker-controlled host. If a victim approves the resulting OAuth consent request, their authorization code is sent to the attacker, who can exchange it for a valid access token. This requires victim interaction and that one of the experimental features is explicitly enabled, which is not the default. This vulnerability is fixed in 0.27.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
Backstage 输入验证错误漏洞
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之前版本存在输入验证错误漏洞，该漏洞源于实验性OIDC提供程序存在重定向URI允许列表绕过，可能导致授权码泄露给攻击者。
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-2026-32235
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-32235 (1)
-
OAuth redirect URI allowlist bypass · Advisory · backstage/backstage · GitHub x_refsource_CONFIRM
Same Patch Batch · @backstage · 2026-03-12 · 3 CVEs total
| CVE-2026-32237 | 4.4 MEDIUM | @backstage/plugin-scaffolder-backend: Possible exposure of defaultEnvironment secrets usin |
| CVE-2026-32236 | @backstage/plugin-auth-backend: SSRF in experimental CIMD metadata fetch |
IV. Related Vulnerabilities
V. Comments for CVE-2026-32235
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