{"id":"CVE-2026-108752","summary":"JupyterHub through 6.0.1 OAuth Client ID Collision via Unescaped Hyphen","details":"JupyterHub through 6.0.1 contains an identifier collision vulnerability that allows authenticated users to overwrite another user's named-server OAuth client by registering a hyphenated username. Attackers holding a name like alice-prod can overwrite the client for alice's server prod, breaking OAuth login and revoking tokens by stopping their own server.","modified":"2026-10-12T02:31:38.545241989Z","published":"2026-10-11T12:19:51.996Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-694"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/108xxx/CVE-2026-108752.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/108xxx/CVE-2026-108752.json"},{"type":"PACKAGE","url":"https://github.com/jupyterhub/jupyterhub"},{"type":"ARTICLE","url":"https://github.com/jupyterhub/jupyterhub/blob/3e516c6f382b481e815ec455befb2f14d80d337b/jupyterhub/oauth/provider.py#L719-L754"},{"type":"ARTICLE","url":"https://github.com/jupyterhub/jupyterhub/blob/3e516c6f382b481e815ec455befb2f14d80d337b/jupyterhub/user.py#L1174-L1186"},{"type":"ARTICLE","url":"https://github.com/jupyterhub/jupyterhub/blob/3e516c6f382b481e815ec455befb2f14d80d337b/jupyterhub/user.py#L563-L567"},{"type":"ADVISORY","url":"https://hackmd.io/@haind/jupyterhub-oauth-client-id-cross-user-collision"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-108752"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/jupyterhub-through-6.0.1-oauth-client-id-collision-via-unescaped-hyphen"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/jupyterhub/jupyterhub","events":[{"introduced":"0"},{"last_affected":"3e516c6f382b481e815ec455befb2f14d80d337b"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0"},{"last_affected":"6.0.1"}]}}],"versions":["6.0.1","6.0.0","6.0.0b3","6.0.0b2","6.0.0b1","5.4.2","5.4.1","5.4.0","5.3.0","5.3.0rc0","5.2.1","5.2.0","5.1.0","5.0.0","5.0.0b2","5.0.0b1","4.0.1","4.0.0","4.0.0b2","4.0.0b1","3.1.0","3.0.0","3.0.0b1","2.2.2","2.2.1","2.2.0","2.1.1","2.1.0","2.0.2","2.0.1","2.0.0","2.0.0rc5","2.0.0rc4","2.0.0rc3","2.0.0rc2","2.0.0rc1","2.0.0b3","2.0.0b2","2.0.0b1","1.4.0","1.3.0","1.2.1","1.0.0","1.2.0","1.2.0b1","1.1.0","1.1.0b1","1.0.0b2","1.0.0b1","0.9.2","0.9.1","0.9.0","0.9.0rc1","0.9.0b3","0.9.0b2","0.9.0b1","0.8.1","0.8.0","0.8.0rc2","0.8.0rc1","0.8.0b5","0.8.0b4","0.8.0b3","0.8.0b2","0.8.0b1","0.7.2","0.7.1","0.7.0","0.6.1","0.6.0","0.5.0","0.4.1","0.4.0","0.3.0","0.2.0","0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-108752.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N"}]}