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CVE-2023-25574 — Vulnerability in jupyterhub-ltiauthenticator —...

CRITICAL

LTI JupyterHub Authenticator does not properly validate JWT Signature

Published February 25, 2025Updated June 5, 2026Source: osv

Summary

### Impact Only users that has configured a JupyterHub installation to use the authenticator class `LTI13Authenticator` are influenced. LTI13Authenticator that was introduced in `jupyterhub-ltiauthenticator` 1.3.0 wasn't validating JWT signatures. This is believed to allow the LTI13Authenticator to authorize a forged request granting access to existing and new user identities. ### Patches None. ### Workarounds None. ### References - [This code segment](https://github.com/jupyterhub/ltiauthenticator/blob/3feec2e81b9d3b0ad6b58ab4226af640833039f3/ltiauthenticator/lti13/validator.py#L122-L164) didn't validate a JWT signature.

Advisory Timeline

  • First published February 25, 2025 (594 days ago).
  • Last revised June 5, 2026 — 465 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

pip
Update jupyterhub-ltiauthenticator to 1.4.0 or later
pip install "jupyterhub-ltiauthenticator>=1.4.0"

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: pypi (1).

PackageEcosystemAffectedFixed In
jupyterhub-ltiauthenticator
pypi
1.3.01.4.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-347
    Improper Verification of Cryptographic SignatureMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 10.0 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

References

Frequently Asked Questions

What is CVE-2023-25574?
LTI JupyterHub Authenticator does not properly validate JWT Signature This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 10.0/10).
How do I check if my project is affected by CVE-2023-25574?
CVE-2023-25574 affects jupyterhub-ltiauthenticator. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2023-25574 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
10.0

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-mcgx-2gcr-p3hp
PYSEC-2025-120

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