{"id":"CVE-2023-25574","aliases":["GHSA-mcgx-2gcr-p3hp","PYSEC-2025-120"],"url":"https://o3.security/vulnerability/CVE-2023-25574","summary":"JupyterHub's LTI13Authenticator: JWT signature not validated","details":"### Impact\n\nOnly users that has configured a JupyterHub installation to use the authenticator class `LTI13Authenticator` are influenced.\n\nLTI13Authenticator 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.\n\n### Patches\n\nNone.\n\n### Workarounds\n\nNone.\n\n### References\n\n- [This code segment](https://github.com/jupyterhub/ltiauthenticator/blob/3feec2e81b9d3b0ad6b58ab4226af640833039f3/ltiauthenticator/lti13/validator.py#L122-L164) didn't validate a JWT signature.","published":"2025-02-25T14:42:33.337Z","modified":"2026-10-28T02:31:01.327849247Z","cvss":{"score":10,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"jupyterhub-ltiauthenticator","fixedVersion":"1.4.0"}],"fix":null,"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"},{"type":"PACKAGE","url":"https://github.com/jupyterhub/ltiauthenticator"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/jupyterhub-ltiauthenticator/PYSEC-2025-120.yaml"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:31:01.327849247Z"}}