{"cve":"CVE-2026-32235","nvd":{"published":"2026-03-12T19:16:17.443","modified":"2026-06-17T10:35:23.907","status":"Undergoing Analysis","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N","score":4.7},"cwes":["CWE-601"],"references":["https://github.com/backstage/backstage/security/advisories/GHSA-wqvh-63mv-9w92"],"products":["linuxfoundation:backstage"],"source":"nvd","synced_at":"2026-10-19T22:25:53.701907451+00:00"},"epss":{"cve":"CVE-2026-32235","score":0.00148,"percentile":0.03979,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-wqvh-63mv-9w92","url":"https://osv.dev/vulnerability/GHSA-wqvh-63mv-9w92","summary":"@backstage/plugin-auth-backend: OAuth redirect URI allowlist bypass","modified":"2026-03-14T01:56:21.282129Z","packages":[{"ecosystem":"npm","name":"@backstage/plugin-auth-backend","purl":"pkg:npm/%40backstage/plugin-auth-backend","ranges":["<0.27.1"],"fixed":["0.27.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}