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CVE-2026-108752

JupyterHub through 6.0.1 OAuth Client ID Collision via Unescaped Hyphen

2.3 LowFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
Low
Availability
Low

Exploit likelihood

0.24%Unchanged since Oct 12, 2026
90%50%10%1%

What each source reports

CVE List Score used 2.3

JupyterHub through 6.0.1 OAuth Client ID Collision via Unescaped Hyphen

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.

Record
CVE-2026-108752
CVSS 4.0
2.3 LowCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
CVSS 3.1
4.2 MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L
Weakness
CWE-694
Updated
2026-11-02
EUVDEUVD-2026-96917 2.3

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.

Record
EUVD-2026-96917
CVSS 4.0
2.3 LowCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-h63v-vvgj-vrfh 2.3

JupyterHub through 6.0.1 contains an identifier collision vulnerability that allows authenticated...

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.

Record
GHSA-h63v-vvgj-vrfh
CVSS 4.0
2.3 LowCVSS: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
CVSS 3.1
4.2 MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L
Weakness
CWE-694
Updated
2026-11-02
NVD 2.3

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.

Record
CVE-2026-108752
CVSS 4.0
2.3 LowCVSS: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
CVSS 3.1
4.2 MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L
Weakness
CWE-694
Updated
2026-11-02
OSV 2.3

JupyterHub through 6.0.1 OAuth Client ID Collision via Unescaped Hyphen

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.

Record
CVE-2026-108752
CVSS 4.0
2.3 LowCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
Weakness
CWE-694
Updated
2026-11-02
OSVDEBIAN-CVE-2026-108752 2.3

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.

Record
DEBIAN-CVE-2026-108752
CVSS 4.0
2.3 LowCVSS: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
Updated
2026-11-02
OSVUBUNTU-CVE-2026-108752 2.3

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.

Record
UBUNTU-CVE-2026-108752
CVSS 4.0
2.3 LowCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
CVSS 3.1
4.2 MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L
Updated
2026-11-02
OSVBIT-jupyterhub-2026-108752 No score

JupyterHub through 6.0.1 OAuth Client ID Collision via Unescaped Hyphen

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.

Record
BIT-jupyterhub-2026-108752
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
jupyterhub
Bitnami
 before 6.1.0
6.1.0
jupyterhub
Debian:12
 All versions, plus listed versions
3.0.0+ds1-15.0.0+ds1-15.0.0+ds1-25.0.0+ds1-35.0.0+ds1-4
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5.2.1+ds1-15.2.1+ds1-25.2.1+ds1-35.2.1+ds1-45.2.1+ds1-5
 None known
jupyterhub
Debian:13
 All versions, plus listed versions
5.2.1+ds1-45.2.1+ds1-5
 None known
jupyterhub
Debian:14
 All versions, plus listed versions
5.2.1+ds1-45.2.1+ds1-5
 None known
jupyterhub
Ubuntu:22.04:LTS
 All versions, plus listed versions
2.0.0+ds1-12.0.0+ds1-2
 None known
jupyterhub
Ubuntu:24.04:LTS
 All versions, plus listed versions
3.0.0+ds1-1
 None known
jupyterhub
Ubuntu:26.10
 All versions, plus listed versions
5.2.1+ds1-45.2.1+ds1-5
 None known
jupyterhub
Ubuntu:26.04:LTS
 All versions, plus listed versions
5.2.1+ds1-4
 None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-108752 is a low vulnerability (CVSS 2.3) in Jupyterhub, published October 11, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.24%, the 15th percentile. Fixed in jupyterhub 6.1.0.

References

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