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CVE-2026-33709

23
FAUCET Score

CVE-2026-33709 identifies an open redirect vulnerability in JupyterHub versions prior to 5.4.4. This flaw allows an attacker to construct a malicious link that, when clicked, redirects users from the JupyterHub login page to an arbitrary attacker-controlled external site, bypassing JupyterHub's security checks. Rated as Medium severity with a CVSS score of 5.1, this vulnerability requires user interaction and primarily poses a risk to confidentiality and integrity. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this issue.

Impacted Technologies

VendorProductVersion(s)CPE
< 5.4.4CPE matchmatch criteria
cpe:2.3:a:jupyter:jupyterhub:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

5.1MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/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

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
ACTIVE
VS Confidentiality
LOW
VS Integrity
LOW
VS Availability
NONE
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.22%
Probability of exploitation in next 30 days
EPSS Percentile
13.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0022 is in the 13th percentile among its peer group of 26,234 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

pippatch availablevia ghsa
Product: jupyterhubFixed in: 5.4.4
github_advisoryworkaround availablevia nvd_reference
View patch

Vendor Advisories (1)

pipGHSA-3vff-hjqv-m7h8medium

JupyterHub has an Open Redirect Vulnerability

Apr 3, 2026

References

github.com / jupyterhub/jupyterhub/releases/tag/5.4.4
Product
github.com / jupyterhub/jupyterhub/security/advisories/GHSA-3vff-hjqv-m7h8
MitigationVendor Advisory