{"id":"CVE-2023-25574","summary":"JupyterHub's LTI13Authenticator: JWT signature not validated","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.","aliases":["GHSA-mcgx-2gcr-p3hp","PYSEC-2025-120"],"modified":"2026-05-20T08:11:27.219813694Z","published":"2025-02-25T14:42:33.337Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/25xxx/CVE-2023-25574.json","cwe_ids":["CWE-347"],"cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/jupyterhub/ltiauthenticator/blob/3feec2e81b9d3b0ad6b58ab4226af640833039f3/ltiauthenticator/lti13/validator.py#L122-L164"},{"type":"WEB","url":"https://github.com/jupyterhub/ltiauthenticator/blob/main/CHANGELOG.md#140---2023-03-01"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/25xxx/CVE-2023-25574.json"},{"type":"ADVISORY","url":"https://github.com/jupyterhub/ltiauthenticator/security/advisories/GHSA-mcgx-2gcr-p3hp"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-25574"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/jupyterhub/ltiauthenticator","events":[{"introduced":"0"},{"last_affected":"50688aa06ea35678c64f34666acdf348b585e33d"}],"database_specific":{"versions":[{"introduced":"0"},{"last_affected":"= 1.3.0"}]}}],"versions":["0.4.0","1.0.0","1.1.0","1.2.0","1.3.0","v0.3"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-25574.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"}]}