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Medium

Open Redirect Vulnerability in jupyter-server

  • Disclosed: 28.08.2023
  • Updated: 11.10.2026 15:17

Impact

Open Redirect Vulnerability. Maliciously crafted login links to known Jupyter Servers can cause successful login or an already logged-in session to be redirected to arbitrary sites, which should be restricted to Jupyter Server-served URLs.

Patches

Upgrade to Jupyter Server 2.7.2

Workarounds

None.

References

Vulnerability reported by user davwwwx via the bug bounty program sponsored by the European Commission and hosted on the Intigriti platform.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Python (PyPI) jupyter-server < 2.7.2 2.7.2

References

CVSS score 6.1/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE)
CWE-601
Platform
Python (PyPI)
Package
jupyter-server
Disclosed
28.08.2023
Updated
11.10.2026 15:17

Sources and licenses

OSV / GitHub Advisory Database - PYSEC-2023-155 - PyPA Advisory Database; CC BY 4.0

OSV / GitHub Advisory Database - GHSA-r726-vmfq-j9j3 - CC BY 4.0

Vulnerability history: jupyter-server

All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (14) in the archive
Total entries
14
First → latest
11.2020 09.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • Critical 1
  • High 7
  • Medium 6

Disclosures per year

Severity:
  1. Jupyter Server: 5xx request logging leaks token-bearing Referer header values
    High · 7.1 CVE-2026-86049 < 2.21.0 2.21.0
  2. Jupyter Server: Stored XSS in `NbconvertFileHandler` / `NbconvertPostHandler` via missing `sandbox` CSP
    Critical · 5.4 CVE-2026-44727 < 2.20.0 2.20.0
  3. Jupyter Server's Authentication Cookies Remain Valid After Password Reset and Server Restart
    High · 6.8 CVE-2026-40934 < 2.18.0 2.18.0
  4. Jupyter Server has a CORS Origin Validation Bypass via `re.match()` in `allow_origin_pat`
    High CVE-2026-40110 < 2.18.0 2.18.0
  5. Jupyter Server: Path Traversal via incorrect startswith() root directory check allows access to sibling directories
    High · 7.1 CVE-2026-35397 < 2.18.0 2.18.0
  6. Jupyter server on Windows discloses Windows user password hash
    High · 7.5 CVE-2024-35178 < 2.14.1 2.14.1
  7. Open Redirect Vulnerability in jupyter-server this entry
    Medium · 6.1 CVE-2023-39968 < 2.7.2 2.7.2
  8. Jupyter server Token bruteforcing
    High · 7.1 CVE-2022-29241 < 1.17.1, >= 2.0.0a0, < 2.0.0a1 1.17.1, 2.0.0a1
  9. The Jupyter Server provides the backend (i.e. the core services, APIs, and REST endpoints) for Jupyter web applications. Prior to version 1.15.4, unauthorized actors can access sensitive information f
    High · 7.5 CVE-2022-24757 < 1.15.4 1.15.4

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