Wallos is an open-source, self-hostable personal subscription tracker
Description
Wallos is an open-source, self-hostable personal subscription tracker
Remediation
Apply vendor security updates immediately. Monitor for exploitation attempts and review access logs.
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VENDOR: Unity Catalog
PRODUCT: Unity Catalog
AFFECTED_VERSIONS: 0.4.0 and earlier
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Description Summary:
Unity Catalog 0.4.0 and earlier contains a critical authentication bypass in the token exchange endpoint due to improper validation of the issuer claim in incoming JSON Web Tokens (JWTs).
Executive Summary:
Unity Catalog versions 0.4.0 and earlier are subject to a critical authentication bypass that allows attackers to spoof identities by providing untrusted JWT issuer claims.
Vulnerability Details
CVE-ID: CVE-2026-27478
Affected Software: Unity Catalog
Affected Versions: 0.4.0 and earlier
Vulnerability: The vulnerability resides in the
/api/1.0/unity-control/auth/tokensendpoint, which extracts the "iss" (issuer) claim from JWTs without verification. An attacker can provide a malicious issuer URL, forcing the system to fetch a JWKS from an attacker-controlled server to "validate" the token's signature.Business Impact
This flaw facilitates a complete authentication bypass, allowing unauthorized users to access data and AI assets managed within the Unity Catalog. Given the CVSS score of 9.1, the impact is severe, potentially leading to the exposure of proprietary machine learning models and sensitive organizational datasets.
Remediation Plan
Immediate Action: Update Unity Catalog to the latest available version (post-0.4.0) that enforces a whitelist of trusted identity providers.
Proactive Monitoring: Audit authentication logs for unusual token exchange requests and monitor outbound network traffic for requests to unknown or suspicious domains originating from the Unity Catalog server.
Compensating Controls: Implement network-level egress filtering to prevent the Unity Catalog server from connecting to untrusted external JWKS endpoints or use a dedicated identity proxy.
Exploitation Status
Public Exploit Available: false
Analyst Notes: As of Mar 11, 2026, there is no public information indicating active exploitation of this vulnerability. However, JWT implementation flaws are frequently targeted once discovered due to the high value of the bypassed security layer.
Analyst Recommendation
The reliance on untrusted issuer claims for signature verification fundamentally breaks the security model of the Unity Catalog. Organizations using this software for data governance must apply the vendor-provided patches immediately to prevent unauthorized access to critical AI infrastructure.