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CVE-2026-32726

SciTokens C++: Sibling-Path Authorization Bypass

8.1 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
None

Exploit likelihood

0.28%Up 0.2 points since Apr 1, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.1

SciTokens C++: Sibling-Path Authorization Bypass

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.

Record
CVE-2026-32726
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-863
Updated
2026-11-02
EUVDEUVD-2026-17563 8.1

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.

Record
EUVD-2026-17563
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-02
NVD 8.1

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.

Record
CVE-2026-32726
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-863
Updated
2026-11-02
OSV 8.1

SciTokens C++: Sibling-Path Authorization Bypass

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.

Record
CVE-2026-32726
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-863
Updated
2026-11-02
OSVDEBIAN-CVE-2026-32726 8.1

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.

Record
DEBIAN-CVE-2026-32726
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-02
OSVUBUNTU-CVE-2026-32726 8.1

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.

Record
UBUNTU-CVE-2026-32726
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
scitokens-cpp
Debian:12
All versions, plus listed versions
0.7.3-11.0.2-11.1.0-11.1.0-1.11.1.0-1.1~exp1
Show 12 moreShow less
1.1.0-21.1.1-11.1.2-11.1.2-21.1.3-11.2.0-11.3.0-11.3.0-21.4.0-11.4.1-11.4.1-21.4.1-3
None known
scitokens-cpp
Debian:13
All versions, plus listed versions
1.1.3-11.2.0-11.3.0-11.3.0-21.4.0-11.4.1-11.4.1-21.4.1-3
None known
scitokens-cpp
Debian:14
before 1.4.1-1, plus listed versions
1.1.3-11.2.0-11.3.0-11.3.0-21.4.0-1
1.4.1-1
scitokens-cpp
Ubuntu:22.04:LTS
All versions, plus listed versions
0.5.1-20.6.2-10.6.2-1ubuntu10.6.2-20.7.0-10.7.0-2
None known
scitokens-cpp
Ubuntu:24.04:LTS
All versions, plus listed versions
1.0.2-11.1.0-11.1.0-1.11.1.0-1.1build21.1.0-1.1build3
None known
scitokens-cpp
Ubuntu:25.10
All versions, plus listed versions
1.1.3-1
None known
scitokens-cpp
Ubuntu:26.10
All versions, plus listed versions
1.3.0-21.4.1-11.4.1-3
None known
scitokens-cpp
Ubuntu:26.04:LTS
All versions, plus listed versions
1.1.3-11.2.0-11.3.0-11.3.0-2
None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-32726 is a high vulnerability (CVSS 8.1) in Scitokens Scitokens-cpp, published March 31, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.28%, the 20th percentile. Fixed in scitokens-cpp 1.4.1-1.

References

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