EUVD-2026-17561CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
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Description
SciTokens C++ is a minimal library for creating and using SciTokens from C or C++. Prior to version 1.4.1, scitokens-cpp is vulnerable to an authorization bypass when processing path-based scopes in tokens. The library normalizes the scope path from the token before authorization and collapses ".." path components instead of rejecting them. As a result, an attacker can use parent-directory traversal in the scope claim to broaden the effective authorization beyond the intended directory. This issue has been patched in version 1.4.1.
Analysis
Authorization bypass in scitokens-cpp library (all versions prior to 1.4.1) allows authenticated attackers to escape path-based scope restrictions via parent-directory traversal in token scope claims. The library incorrectly normalizes '..' components instead of rejecting them, enabling privilege escalation to access resources outside intended directories. …
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Remediation
Within 24 hours: Identify all applications and services using scitokens-cpp library versions prior to 1.4.1 across production and non-production environments. Within 7 days: Contact the scitokens-cpp maintainers for version 1.4.1 release timeline and interim guidance; implement network segmentation to restrict authenticated user access to sensitive directory hierarchies. …
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