{"cve":"CVE-2026-106488","nvd":{"published":"2026-10-06T21:17:17.623","modified":"2026-10-22T14:44:06.520","status":"Analyzed","description":"Backstage is an open framework for building developer portals. Prior to 0.4.20, the @backstage/plugin-auth-backend-module-oidc-provider package is affected by improper authentication in the oidc provider. Deployments using OIDC email-based identity resolution with a provider that permits unverified email addresses may allow an authenticated provider user to assume another catalog identity. This may grant access and permissions associated with that user. No direct availability impact is demonstrated. This issue is fixed in version 0.4.20.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","score":8.1},"cwes":["CWE-287"],"references":["https://github.com/backstage/backstage/commit/1b1f05e82161aaabc226c1d7d498d746956bf942","https://github.com/backstage/backstage/releases/tag/v1.54.6","https://github.com/backstage/backstage/security/advisories/GHSA-826h-28h9-65hg"],"products":["linuxfoundation:backstage","linuxfoundation:backstage\\/plugin-auth-backend-module-oidc-provider"],"source":"nvd","synced_at":"2026-10-22T16:41:11.231219466+00:00"},"epss":{"cve":"CVE-2026-106488","score":0.0028,"percentile":0.20324,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-826h-28h9-65hg","url":"https://osv.dev/vulnerability/GHSA-826h-28h9-65hg","summary":"Backstage: Improper authentication in the OIDC provider","modified":"2026-10-07T18:15:10.726184367Z","packages":[{"ecosystem":"npm","name":"@backstage/plugin-auth-backend-module-oidc-provider","purl":"pkg:npm/%40backstage/plugin-auth-backend-module-oidc-provider","ranges":["<0.4.20"],"fixed":["0.4.20"]}]}],"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."]}