CVE-2026-108752CWE-694

CVE-2026-108752

Medium · published October 11, 2026

CVSS v3.1
4.2
EPSS
0%
Percentile
14.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.2 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L
CVSS v4.0
2.3 · 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
EPSS
0.00245 · 14.8th percentile
Weakness
CWE-694 · Use of Multiple Resources with Duplicate Identifier
Published
2026-10-11T17:17Z
References (6)
https://github.com/jupyterhub/jupyterhub · [email protected]https://github.com/jupyterhub/jupyterhub/blob/3e516c6f382b481e815ec455befb2f14d80d337b/jupyterhub/oauth/provider.py#L719-L754 · [email protected]https://github.com/jupyterhub/jupyterhub/blob/3e516c6f382b481e815ec455befb2f14d80d337b/jupyterhub/user.py#L1174-L1186 · [email protected]https://github.com/jupyterhub/jupyterhub/blob/3e516c6f382b481e815ec455befb2f14d80d337b/jupyterhub/user.py#L563-L567 · [email protected]https://hackmd.io/@haind/jupyterhub-oauth-client-id-cross-user-collision · [email protected]https://www.vulncheck.com/advisories/jupyterhub-through-6.0.1-oauth-client-id-collision-via-unescaped-hyphen · [email protected]
EPSS history
Timeline
  • 13 OCT 03:28Z
    EPSS moved — → 0%
    epss
  • 11 OCT 12:19Z
    JupyterHub through 6.0.1 OAuth Client ID Collision via Unescaped Hyphen
    cvelistv5
  • 11 OCT 12:19Z
    JupyterHub through 6.0.1 OAuth Client ID Collision via Unescaped Hyphen
    cvelistv5