Session token theft via unchecked URL joining
Published Jan 19, 2024 · Updated Jun 17, 2025
Relative path traversal in JupyterLab before 3.6.7 and 4.0.0 through 4.0.10 allows remote attackers to steal session tokens via a malicious link. Multiple client URL builders joined attacker-controlled identifiers or locales to service base paths without confirming that each result retained the expected prefix. A victim must click the crafted link while using an older jupyter-server; the resulting redirect exposes Authorization and XSRFToken values to a third party.
Summary
What happened
Relative path traversal in JupyterLab before 3.6.7 and 4.0.0 through 4.0.10 allows remote attackers to steal session tokens via a malicious link. Multiple client URL builders joined attacker-controlled identifiers or locales to service base paths without confirming that each result retained the expected prefix. A victim must click the crafted link while using an older jupyter-server; the resulting redirect exposes Authorization and XSRFToken values to a third party.
The record
- CVE
- CVE-2024-22421
- Published
- Jan 19, 2024
- Updated
- Jun 17, 2025
- Vendor
- Project Jupyter
- Product
- JupyterLab
- Classifications
- CWE-23, CWE-200, T1566.002
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 19, 2024CVE publishedPublication date reported by the CVE source.
- Jun 17, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 3.6.7
- Affected versionversion=>=4.0.0,< 4.0.11
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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