PT-2026-71711

Backstage is an open framework for building developer portals. Prior to 0.29.2, the experimental dynamic client registration and client ID metadata document features in the @backstage/plugin-auth-backend use full-string matcher.isMatch glob matching for...

CVE-2026-73563: URL Redirection to Untrusted Site

Backstage is an open framework for building developer portals. Prior to 0.29.2, the experimental dynamic client registration and client ID metadata document features in the @backstage/plugin-auth-backend use full-string matcher.isMatch glob matching for...

@backstage/plugin-auth-backend (>=0.0.0-nightly-20240122021809, <=0.22.11), @backstage/plugin-auth-backend-module-aws-alb-provider (>=0.0.0-nightly-20240126021148, <=0.4.13-next.1) +11 more potentially affected by CVE-2026-32235 via @backstage/plugin-auth-backend (>=0.0.0-nightly-20240929023448, <=0.27.0-next.1)

@backstage/plugin-auth-backend NPM version =0.0.0-nightly-20240929023448, =0.0.0-nightly-20240122021809, =0.0.0-nightly-20240126021148, =0.0.0-nightly-20240122021809, =0.0.0-nightly-202201422556, =0.0.0-nightly-202111222339, =0.0.0-nightly-2021102522541, =0.0.0-nightly-20220203021748, =1.0.0,...

CVE-2026-32236: Server-Side Request Forgery (SSRF)

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 clientid...

CVE-2026-32235: URL Redirection to Untrusted Site

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 a...

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 i...

CVE-2021-43776 XSS vulnerability in @backstage/plugin-auth-backend

Backstage is an open platform for building developer portals. In affected versions the auth-backend plugin 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...