CVE-2026-27478
CVE-2026-27478 is a critical-severity vulnerability in Unitycatalog with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-290.
Key facts
- Severity: Critical (CVSS 3.x base score 9.1)
- EPSS exploit prediction: 0% (8th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-11304
- Weakness: CWE-290
- Affected product: Unitycatalog
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is CVE-2026-27478?
- 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.
- How severe is CVE-2026-27478?
- CVE-2026-27478 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
- Is CVE-2026-27478 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-27478?
- CVE-2026-27478 affects Unitycatalog. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-27478?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- Does CVE-2026-27478 have an EU (EUVD) identifier?
- Yes. CVE-2026-27478 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11304.
- When was CVE-2026-27478 published?
- CVE-2026-27478 was published on 2026-03-11 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:unitycatalog:unitycatalog:*:*:*:*:data:*:*:*
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