High severity8.1NVD Advisory· Published Jul 10, 2026· Updated Jul 14, 2026
CVE-2026-56668
CVE-2026-56668
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.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/zitadel/zitadelGo | < 4.15.3 | 4.15.3 |
Affected products
2- osv-coordsRange: < 0.0.20260916T180043-160000.1.1
Patches
Vulnerability mechanics
References
5- github.com/advisories/GHSA-vrh8-c9cm-wh8vghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-56668ghsaADVISORY
- github.com/zitadel/zitadel/commit/e2886a61670ca8fd41c9434f87036546e5620bccnvdWEB
- github.com/zitadel/zitadel/releases/tag/v4.15.3nvdWEB
- github.com/zitadel/zitadel/security/advisories/GHSA-vrh8-c9cm-wh8vnvdWEB
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