CVE-2026-32235

MEDIUM5.9EPSS 0.03%

@backstage/plugin-auth-backend: OAuth redirect URI allowlist bypass

發布日:2026/3/12修改日:2026/3/14

描述

### Impact 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. ### Patches Upgrade to `@backstage/plugin-auth-backend` version 0.27.1 or later. ### Workarounds Disable experimental Dynamic Client Registration and Client ID Metadata Documents features if they are not required. ### References - [RFC 6749 Section 3.1.2 - Redirection Endpoint](https://datatracker.ietf.org/doc/html/rfc6749#section-3.1.2)

受影響套件(1)

CVSS 分數

來源版本嚴重程度向量
osvCVSS 3.1MEDIUM5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N

參考連結(4)