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# CVE-2023-25574: LTI13Authenticator: JWT signature not validated
- URL: https://darkwebinformer.com/cve-2023-25574-lti13authenticator-jwt-signature-not-validated/
- Published: 2025-02-25T15:28:25.000Z
- Updated: 2025-09-04T22:23:49.000Z
- Author: Dark Web Informer
- Tags: Vulnerabilities

🚨 Critical Security Vulnerability  
🆔 CVE-2023-25574  
💣 CVSS Score: 10  
📅 Published Date: 2025-02-25

⚠️ Details: \`jupyterhub-ltiauthenticator\` is a JupyterHub authenticator for learning tools interoperability (LTI). 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. Only users that has configured a JupyterHub installation to use the authenticator class \`LTI13Authenticator\` are affected. \`jupyterhub-ltiauthenticator\` version 1.4.0 removes LTI13Authenticator to address the issue. No known workarounds are available.

🛠 References:  
🔗 GitHub: <https://github.com/jupyterhub/ltiauthenticator/blob/main/CHANGELOG.md#140---2023-03-01>  
🔗 GitHub 2: <https://github.com/jupyterhub/ltiauthenticator/security/advisories/GHSA-mcgx-2gcr-p3hp>  
🔗 GitHub 3: <https://github.com/jupyterhub/ltiauthenticator/blob/3feec2e81b9d3b0ad6b58ab4226af640833039f3/ltiauthenticator/lti13/validator.py#L122-L164>  
🔗 NIST: <https://nvd.nist.gov/vuln/detail/CVE-2023-25574>