CVE-2026-108752 json
JupyterHub through 6.0.1 OAuth Client ID Collision via Unescaped Hyphen
published 2026-10-11 28 d ago modified 2026-10-16 23 d ago also BIT-jupyterhub-2026-108752 , EUVD-2026-96917
- cvss
- 4.2
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 15%
- public exploits
- 0
- none known
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 can overwrite the client for alice's server prod, breaking OAuth login and revoking tokens by stopping their own server.
Patch / fix
- bitnami jupyterhub 6.1.0
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 26 d ago
Exploit prediction
0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 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 |
| CNA | 3.1 | 4.2 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L |
| CNA | 4.0 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| OSV | 3.1 | 4.2 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | jupyterhub | <6.1.0 |
6.1.0 |
Affected products
- jupyterhub jupyterhub
Classification
- Weakness
-
- CWE-694 Use of Multiple Resources with Duplicate Identifier
References
-
hackmd.io
/@haind/jupyterhub-oauth-client-id-cross-user-collision
third-party-advisory, web
-
github.com
/jupyterhub/jupyterhub/blob/3e516c6f382b481e815ec455befb2f14d80d337b/jupyterhub/user.py#L563-L567
technical-description, web
-
github.com
/jupyterhub/jupyterhub/blob/3e516c6f382b481e815ec455befb2f14d80d337b/jupyterhub/oauth/provider.py#L719-L754
technical-description, web
-
github.com
/jupyterhub/jupyterhub/blob/3e516c6f382b481e815ec455befb2f14d80d337b/jupyterhub/user.py#L1174-L1186
technical-description, web
-
github.com
/jupyterhub/jupyterhub
product, web
-
vulncheck.com
/advisories/jupyterhub-through-6.0.1-oauth-client-id-collision-via-unescaped-hyphen
third-party-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-108752
web
Sources
- CVE List CVE-2026-108752
- NVD CVE-2026-108752
- OSV BIT-jupyterhub-2026-108752
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.