{"cve":"CVE-2026-32236","nvd":{"published":"2026-03-12T19:16:18.867","modified":"2026-06-17T10:35:24.013","status":"Undergoing Analysis","description":"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\nmetadata fetch validates the initial client_id hostname against private IP ranges but does not apply the same validation after HTTP redirects. The practical impact is limited. The attacker cannot read the response body from the internal request, cannot control request headers or method, and the feature must be explicitly enabled via an experimental flag that is off by default. Deployments that restrict allowedClientIdPatterns to specific trusted domains are not affected. Patched in @backstage/plugin-auth-backend version 0.27.1.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U","score":1.7},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5},"cwes":["CWE-918"],"references":["https://github.com/backstage/backstage/commit/17038abf2dfdb4abc08a59b1c95af39851de0e07","https://github.com/backstage/backstage/security/advisories/GHSA-qp4c-xg64-7c6x"],"products":["linuxfoundation:backstage"],"source":"nvd","synced_at":"2026-10-19T22:25:53.701907451+00:00"},"epss":{"cve":"CVE-2026-32236","score":0.00311,"percentile":0.23985,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-qp4c-xg64-7c6x","url":"https://osv.dev/vulnerability/GHSA-qp4c-xg64-7c6x","summary":"@backstage/plugin-auth-backend: SSRF in experimental CIMD metadata fetch","modified":"2026-04-15T21:03:48.712235Z","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."]}