Medium severity4.2NVD Advisory· Published Oct 11, 2026

CVE-2026-108752

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.

Affected products

Jupyter/Jupyterhubllm-fuzzy
Range: <=6.0.1

Patches

Vulnerability mechanics

References

github.com/jupyterhub/jupyterhub/blob/3e516c6f382b481e815ec455befb2f14d80d337b/jupyterhub/oauth/provider.pynvd
github.com/jupyterhub/jupyterhub/blob/3e516c6f382b481e815ec455befb2f14d80d337b/jupyterhub/user.pynvd
github.com/jupyterhub/jupyterhub/blob/3e516c6f382b481e815ec455befb2f14d80d337b/jupyterhub/user.pynvd
hackmd.io/@haind/jupyterhub-oauth-client-id-cross-user-collisionnvd
www.vulncheck.com/advisories/jupyterhub-through-6.0.1-oauth-client-id-collision-via-unescaped-hyphennvd

News mentions

No linked articles in our index yet.

cvss	0.273
epss	0.000
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000