What’s Vulnerable › Vulnerabilities

CVE-2026-32726: SciTokens C++: Sibling-Path Authorization Bypass

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-31 · updated 2026-07-24
• Weakness: CWE-863

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 in path-based scope validation. The enforcer used a simple string-prefix comparison when checking whether a requested resource path was covered by a token's authorized scope path. Because the check did not require a path-segment boundary, a token scoped to one path could incorrectly authorize access to sibling paths that merely started with the same prefix. 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/decfe2f00cb9cabbf1e17a3bb2cd4ea1bbbd8a73
• https://github.com/scitokens/scitokens-cpp/security/advisories/GHSA-q5fm-fgvx-32jq
• https://github.com/scitokens/scitokens-cpp/security/advisories/GHSA-q5fm-fgvx-32jq

Get alerted when CVE-2026-32726 or the next vulnerability affects your stack