CVE-2026-56668
High
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.
SeverityHigh
CVSS8.1
Exploit probability—
ProductGithub.com/zitadel/zitadel
PublishedJul 10, 2026
First seenJul 10, 2026
Weakness typeCWE-862Missing authorization
How to fix
Update
- github.com/zitadel/zitadel4.15.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| github.com/zitadel/zitadelGo | v < 4.15.3, No range specified | 4.15.3 |
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