{"cve":"CVE-2026-56668","nvd":{"published":"2026-07-10T18:16:24.413","modified":"2026-07-14T14:16:35.310","status":"Deferred","description":"ZITADEL is an open source identity management platform. Prior to 4.15.3, ZITADEL's OAuth2 Token Exchange endpoint for urn:ietf:params:oauth:grant-type:token-exchange does not verify that the subject token belongs to the requesting client or that requested scopes remain within the original token's scopes, allowing a low-privilege token to be exchanged for elevated permissions at another application. This issue is fixed in version 4.15.3.","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-862"],"references":["https://github.com/zitadel/zitadel/commit/e2886a61670ca8fd41c9434f87036546e5620bcc","https://github.com/zitadel/zitadel/releases/tag/v4.15.3","https://github.com/zitadel/zitadel/security/advisories/GHSA-vrh8-c9cm-wh8v"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:44:02.134301115+00:00"},"epss":{"cve":"CVE-2026-56668","score":0.00413,"percentile":0.35539,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-vrh8-c9cm-wh8v","url":"https://osv.dev/vulnerability/GHSA-vrh8-c9cm-wh8v","summary":"ZITADEL: Unauthorized Token Privilege Escalation in OAuth2 Token Exchange","modified":"2026-09-17T17:40:44.830526910Z","packages":[{"ecosystem":"Go","name":"github.com/zitadel/zitadel","purl":"pkg:golang/github.com/zitadel/zitadel","ranges":["<4.15.3"],"fixed":["4.15.3"]}]},{"id":"GO-2026-6474","url":"https://osv.dev/vulnerability/GO-2026-6474","summary":"ZITADEL: Unauthorized Token Privilege Escalation in OAuth2 Token Exchange in github.com/zitadel/zitadel","modified":"2026-09-17T17:30:12.896228408Z","packages":[{"ecosystem":"Go","name":"github.com/zitadel/zitadel","purl":"pkg:golang/github.com/zitadel/zitadel","ranges":["all versions"],"fixed":[]}]}],"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."]}