CVE-2023-25574: LTI JupyterHub Authenticator does not properly validate JWT Signature
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.
Published Feb 25, 2025 · Updated Jun 5, 2026
Affected packages
jupyterhub-ltiauthenticator
- Ecosystem
- PyPI
- Affected
- = 1.3.0
- Fixed in
- 1.4.0
- Check
pip show jupyterhub-ltiauthenticator
Advisory details
From the GitHub Advisory Database (CC BY 4.0).
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 didn't validate a JWT signature.
Credited to consideRatio.
References
- https://github.com/jupyterhub/ltiauthenticator/security/advisories/GHSA-mcgx-2gcr-p3hp
- https://nvd.nist.gov/vuln/detail/CVE-2023-25574
- https://github.com/jupyterhub/ltiauthenticator/blob/3feec2e81b9d3b0ad6b58ab4226af640833039f3/ltiauthenticator/lti13/validator.py#L122-L164
- https://github.com/jupyterhub/ltiauthenticator/blob/main/CHANGELOG.md#140---2023-03-01
- https://github.com/pypa/advisory-database/tree/main/vulns/jupyterhub-ltiauthenticator/PYSEC-2025-120.yaml
- https://github.com/advisories/GHSA-mcgx-2gcr-p3hp
How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology