{"id":"CVE-2026-108752","title":"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","summary":"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 …","severity":"medium","cvss":4.2,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L","cwe":["CWE-694"],"published":"2026-10-11","updated":"2026-10-11","sourceUpdated":"2026-10-11T13:17:20.097","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-108752","references":[{"url":"https://github.com/jupyterhub/jupyterhub","label":"disclosure@vulncheck.com"},{"url":"https://github.com/jupyterhub/jupyterhub/blob/3e516c6f382b481e815ec455befb2f14d80d337b/jupyterhub/oauth/provider.py#L719-L754","label":"disclosure@vulncheck.com"},{"url":"https://github.com/jupyterhub/jupyterhub/blob/3e516c6f382b481e815ec455befb2f14d80d337b/jupyterhub/user.py#L1174-L1186","label":"disclosure@vulncheck.com"},{"url":"https://github.com/jupyterhub/jupyterhub/blob/3e516c6f382b481e815ec455befb2f14d80d337b/jupyterhub/user.py#L563-L567","label":"disclosure@vulncheck.com"},{"url":"https://hackmd.io/@haind/jupyterhub-oauth-client-id-cross-user-collision","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/jupyterhub-through-6.0.1-oauth-client-id-collision-via-unescaped-hyphen","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"ingestedAt":"2026-10-11T13:51:17.038Z","slug":"CVE-2026-108752","body":"## Overview\n\nJupyterHub 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":23,"depthScoreParts":{"impact":23.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}