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    <lastBuildDate>Wed, 07 Oct 2026 20:35:02 +0000</lastBuildDate>
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      <title>CVE-2026-27478 — Unity Catalog has a JWT Issuer Validation Bypass Allows Complete User Impersonation</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-27478</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; unitycatalog&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; unitycatalog&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;</content:encoded>
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