{"id":"CVE-2026-108752","revision":"0ecb139ca21f4d3ca777e6d87640db55","records":[{"revision":"0ecb139ca21f4d3ca777e6d87640db55","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-108752","aliases":[],"title":"JupyterHub through 6.0.1 OAuth Client ID Collision via Unescaped Hyphen","description":"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.","state":0,"publishedAt":"2026-10-11T12:19:51.996+00:00","modifiedAt":"2026-10-13T17:00:17.356+00:00","affected":[{"ecosystem":"Vendor product","name":"jupyterhub","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"jupyterhub\",\n                    \"product\": \"jupyterhub\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"lessThanOrEqual\": \"6.0.1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"packageURL\": \"pkg:pypi/jupyterhub\",\n                    \"repo\": \"https://github.com/jupyterhub/jupyterhub\"\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":2.3,"severity":"LOW"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L","score":4.2,"severity":"MEDIUM"}],"references":["https://hackmd.io/@haind/jupyterhub-oauth-client-id-cross-user-collision","https://github.com/jupyterhub/jupyterhub/blob/3e516c6f382b481e815ec455befb2f14d80d337b/jupyterhub/user.py#L563-L567","https://github.com/jupyterhub/jupyterhub/blob/3e516c6f382b481e815ec455befb2f14d80d337b/jupyterhub/oauth/provider.py#L719-L754","https://github.com/jupyterhub/jupyterhub/blob/3e516c6f382b481e815ec455befb2f14d80d337b/jupyterhub/user.py#L1174-L1186","https://github.com/jupyterhub/jupyterhub","https://www.vulncheck.com/advisories/jupyterhub-through-6.0.1-oauth-client-id-collision-via-unescaped-hyphen"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-108752","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-108752","identifiers":["CVE-2026-108752"]},"retained":false,"historicalAffected":[]}],"coverage":[]}