Vulnerability · Published Feb 25, 2025 · Assigned by GitHub_M

CVE-2023-25574JupyterHub's LTI13Authenticator: JWT signature not validated

Critical 10.0

In plain English

A critical-severity security flaw in ltiauthenticator from jupyterhub. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)10.0Critical

Exploit odds (30 days)0.4%top 70.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

`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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	jupyterhub-ltiauthenticator	1.4.0	GHSA-mcgx-2gcr-p3hp
PyPI	jupyterhub-ltiauthenticator	no fix listed	PYSEC-2025-120

Affected products (as reported)

Vendor	Product	Versions
jupyterhub	ltiauthenticator	= 1.3.0

Weakness: CWE-347 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

References

https://github.com/jupyterhub/ltiauthenticator/security/advisories/GHSA-mcgx-2gcr-p3hp x_refsource_CONFIRM
https://github.com/jupyterhub/ltiauthenticator/blob/3feec2e81b9d3b0ad6b58ab4226af640833039f3/ltiauthenticator/lti13/validator.py#L122-L164 x_refsource_MISC
https://github.com/jupyterhub/ltiauthenticator/blob/main/CHANGELOG.md#140---2023-03-01 x_refsource_MISC