CVE-2026-56668 json
ZITADEL: Unauthorized Token Privilege Escalation in OAuth2 Token Exchange
published 4mo ago modified last mo. also EUVD-2026-42967 , GHSA-vrh8-c9cm-wh8v , GO-2026-6474
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 35%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- go github.com/zitadel/zitadel 4.15.3
- zitadel zitadel 4.15.3
- govulncheck-vulndb SLES 16.0, SLES for SAP applications 16.0 0.0.20260916T180043-160000.1.1
suse advisories SUSE-SU-2026:23855-1SUSE-SU-2026:23863-1
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260916T180043-160000.1.1
opensuse advisories openSUSE-SU-2026:21897-1
Is CVE-2026-56668 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 3mo ago
Exploit prediction
0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
| GitHub | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/zitadel/zitadel | <4.15.3 all versions |
4.15.3 |
Affected products
- zitadel zitadel
Classification
- Weakness
-
- CWE-862 Missing Authorization
References
-
github.com
/zitadel/zitadel/commit/e2886a61670ca8fd41c9434f87036546e5620bcc
web, patch
-
github.com
/zitadel/zitadel/security/advisories/GHSA-vrh8-c9cm-wh8v
web, advisory
-
github.com
/zitadel/zitadel/releases/tag/v4.15.3
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-56668
advisory
-
github.com
/zitadel/zitadel
package
Sources
- CVE List CVE-2026-56668
- GitHub Advisory GHSA-vrh8-c9cm-wh8v
- NVD CVE-2026-56668
- OSV GO-2026-6474
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.