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CVE-2026-32725: SciTokens C++: Relative Path Traversal Vulnerability

• Severity: high (CVSS 8.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-31 · updated 2026-07-24
• Weakness: CWE-23

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.

Affected products

• scitokens-cpp: before 1.4.1 — fixed in 1.4.1

How to fix

Upgrade to a fixed version: scitokens-cpp 1.4.1. Check the vendor advisory for mitigations.

References

• https://github.com/scitokens/scitokens-cpp/commit/7951ed809967d88c00c20de414b1ff74df8c3e08
• https://github.com/scitokens/scitokens-cpp/security/advisories/GHSA-rqcx-mc9w-pjxp

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