CVE-2026-108752

JupyterHub through 6.0.1 OAuth Client ID Collision via Unescaped Hyphen

CVSS score

2.3

EPSS probability

—

Risk score

0.2

Published

19 h ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

Patch status has not yet been verified

Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.

Impact on My Inventory

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Vulnerability description

CVE AI research

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DayBreach AI Explanation

Verified against sources

JupyterHub OAuth Client ID Collision Vulnerability

Sources read

Source agreement

0/2

Evidence confidence

%39

Short explanation

JupyterHub through version 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.

Why does it matter?

This vulnerability enables attackers to break OAuth login for other users and revoke active tokens by stopping their own server.

What should be done?

Follow the vendor advisory and updates
Review username registration mechanisms

Note on uncertainty

3 alanda kaynak uyuşmazlığı var. DayBreach bu değerleri saklamadı; kaynak karşılaştırması aşağıda gösteriliyor.

Chain of evidence and sources2 verified claims

JupyterHub 6.0.1 ve önceki sürümler, tire işaretli kullanıcı adları üzerinden OAuth istemci çakışmasına izin verir.

S0 · daybreach-canonical S1 · cvelist

Saldırganlar bu zafiyeti kullanarak OAuth oturum açma akışını bozabilir ve belirteçleri iptal edebilir.

S0 · daybreach-canonical S2 · nvd

Show the technical text from the sources

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.

CVSS vector: 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

CWE: CWE-694

Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-108752 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	jupyterhub	jupyterhub	View

Total affected vendors: 1|Products: 1

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCORE	VERSION	SEVERITY	VECTOR	SOURCE
4.2	CVSS V31	MEDIUM	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L	NVD
4.2	CVSS V3_1	MEDIUM	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L	CVE CNA
2.3	CVSS V40	LOW	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	NVD
2.3	CVSS V4_0	LOW	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	CVE CNA

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.

Restrict access to internet-facing services and apply network segmentation.

Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.

Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-108752 is associated with the following CWEs:

CWE-694: Common Weakness Enumeration Entry CWE-694

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-108752 weaknesses.

CAPEC-66: SQL Injection CAPEC-126: Path Traversal CAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden

PermissionsLow

UserGerekmiyor

Official Sources and Advisories

https://hackmd.io/@haind/jupyterhub-oauth-client-id-cross-user-collisionvendor-advisory https://github.com/jupyterhub/jupyterhub/blob/3e516c6f382b481e815ec455befb2f14d80d337b/jupyterhub/user.py#L563-L567vendor-advisory https://github.com/jupyterhub/jupyterhub/blob/3e516c6f382b481e815ec455befb2f14d80d337b/jupyterhub/oauth/provider.py#L719-L754vendor-advisory https://github.com/jupyterhub/jupyterhub/blob/3e516c6f382b481e815ec455befb2f14d80d337b/jupyterhub/user.py#L1174-L1186vendor-advisory https://github.com/jupyterhub/jupyterhubvendor-advisory VulnCheck Advisory: JupyterHub through 6.0.1 OAuth Client ID Collision via Unescaped Hyphenvendor-advisory

CVSS Vector Radar Chart

2.3 / 10

Vulnerability Scoring Details

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

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow privileges

User InteractionNone required

Confidentiality (Gizlilik)Low

Integrity (Bütünlük)None

Availability (Erişilebilirlik)Low

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Follow the vendor

jupyterhub

Weakness Type (CWE & CAPEC)

CWE-694

Similar Vulnerabilities

5.3

CVE-2026-54338

JupyterHub: Unauthenticated Denial of Service via Unbounded Username Logging on Failed Login

VendorjupyterhubProductjupyterhub+2 etkilenen

Patch verifiedEPSS %02 mo ago

Get this vulnerability through the API

Affected products, version ranges, exploitation status and patch information in a single request, with a free key.

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  "https://api.enginteksut.com.tr/api/v1/intel/cves/CVE-2026-108752"