CVE-2026-108752
Medium
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.
SeverityMedium
CVSS4.2
Exploit probability—
ProductJupyterhub
PublishedOct 11, 2026
First seenOct 11, 2026
Weakness typeCWE-694CWE-694
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| jupyterhub jupyterhub | v ≤ 6.0.1 | — |
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