4vulnerabilities
- Critical0 (0.0%)
- High1 (25.0%)
- Medium0 (0.0%)
- Moderate2 (50.0%)
- Low1 (25.0%)
backstage-plugin-auth-backend
Ecosystem: npm
Downloads: 633.74 K
- 0CriticalAffects 0 versions
- 1HighAffects 1 version
- 0MediumAffects 0 versions
- 2ModerateAffects 2 versions
- 1LowAffects 1 version
Monthly breakdown
- Critical
- High
- Medium
- Moderate
- Low
- 1 vulnerabilities
- Critical: 0
- High: 0
- Medium: 0
- Moderate: 1
- Low: 0
- 2 vulnerabilities
- Critical: 0
- High: 0
- Medium: 0
- Moderate: 1
- Low: 1
- 1 vulnerabilities
- Critical: 0
- High: 1
- Medium: 0
- Moderate: 0
- Low: 0
Vulnerabilities (4)
Known vulnerabilities affecting backstage-plugin-auth-backend, based on data from OSV.
| ID | Severity | Summary | Affected versions | Published | Source |
|---|---|---|---|---|---|
| GHSA-38hq-7x33-php4 | Moderate | @backstage/plugin-auth-backend: Unauthenticated OAuth account takeover via `redirect_uri` allowlist bypass### Impact The allowlist matching used by the experimental dynamic client registration and client ID metadata document (CIMD) features in `@backstage/plugin-auth-backend` matched glob patterns against the full URL string. A * wildcard could therefore match across URL component boundaries: a pattern such as `https://*.example.com/callback`, intended to allow subdomains of a trusted host, would also match an attacker-controlled URL such as `https://attacker.example/x.example.com/callback`. This applies to `auth.experimentalDynamicClientRegistration.allowedRedirectUriPatterns` as well as the `all |
| GitHub (opens in a new tab) | |
| GHSA-qp4c-xg64-7c6x | Low | @backstage/plugin-auth-backend: SSRF in experimental CIMD metadata fetch### Impact 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. Th |
| GitHub (opens in a new tab) | |
| GHSA-wqvh-63mv-9w92 | Moderate | @backstage/plugin-auth-backend: OAuth redirect URI allowlist bypass### 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 |
| GitHub (opens in a new tab) | |
| GHSA-w7fj-336r-vw49 | High | Cross-Site Scripting vulnerability in @backstage/plugin-auth-backend### Impact This vulnerability allows a malicious actor to trick another user into visiting a vulnerable URL that executes an XSS attack. This attack can potentially allow the attacker to exfiltrate access tokens or other secrets from the user's browser. The default CSP does prevent this attack, but it is expected that some deployments have these policies disabled due to incompatibilities. ### Patches This is vulnerability is patched in version `0.4.9` of `@backstage/plugin-auth-backend`. ### For more information If you have any questions or comments about this advisory: * Open an issue in t |
| GitHub (opens in a new tab) |
- GHSA-38hq-7x33-php4Moderate@backstage/plugin-auth-backend: Unauthenticated OAuth account takeover via `redirect_uri` allowlist bypass
< 0.29.2
### Impact The allowlist matching used by the experimental dynamic client registration and client ID metadata document (CIMD) features in `@backstage/plugin-auth-backend` matched glob patterns against the full URL string. A * wildcard could therefore match across URL component boundaries: a pattern such as `https://*.example.com/callback`, intended to allow subdomains of a trusted host, would also match an attacker-controlled URL such as `https://attacker.example/x.example.com/callback`. This applies to `auth.experimentalDynamicClientRegistration.allowedRedirectUriPatterns` as well as the `all
CVE: CVE-2026-73563
- GHSA-qp4c-xg64-7c6xLow@backstage/plugin-auth-backend: SSRF in experimental CIMD metadata fetch
< 0.27.1
### Impact 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. Th
CVE: CVE-2026-32236
- GHSA-wqvh-63mv-9w92Moderate@backstage/plugin-auth-backend: OAuth redirect URI allowlist bypass
< 0.27.1
### 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
CVE: CVE-2026-32235
- GHSA-w7fj-336r-vw49HighCross-Site Scripting vulnerability in @backstage/plugin-auth-backend
< 0.4.9
### Impact This vulnerability allows a malicious actor to trick another user into visiting a vulnerable URL that executes an XSS attack. This attack can potentially allow the attacker to exfiltrate access tokens or other secrets from the user's browser. The default CSP does prevent this attack, but it is expected that some deployments have these policies disabled due to incompatibilities. ### Patches This is vulnerability is patched in version `0.4.9` of `@backstage/plugin-auth-backend`. ### For more information If you have any questions or comments about this advisory: * Open an issue in t
CVE: CVE-2021-43776