CVE-2026-27478 json
Unity Catalog has a JWT Issuer Validation Bypass Allows Complete User Impersonation
published 2026-03-11 7 mo ago modified 2026-06-17 4 mo ago also GHSA-qqcj-rghw-829x , EUVD-2026-11304
- cvss
- 9.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 10%
- public exploits
- 0
- none known
Summary
Unity Catalog is an open, multi-modal Catalog for data and AI. In 0.4.0 and earlier, a critical authentication bypass vulnerability exists in the Unity Catalog token exchange endpoint (/api/1.0/unity-control/auth/tokens). The endpoint extracts the issuer (iss) claim from incoming JWTs and uses it to dynamically fetch the JWKS endpoint for signature validation without validating that the issuer is a trusted identity provider.
Patch / fix
- maven io.unitycatalog:unitycatalog-server 0.4.1
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 7 mo ago
Exploit prediction
0.21% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
| GitHub | 3.1 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| maven | io.unitycatalog:unitycatalog-server | <0.4.1 |
0.4.1 |
Affected products
- unitycatalog unitycatalog
Classification
References
Sources
- CVE List CVE-2026-27478
- GitHub Advisory GHSA-qqcj-rghw-829x
- NVD CVE-2026-27478
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