CVE-2022-29241Network attack vector

Access-token disclosure via unchecked hidden-file paths

Published Jun 14, 2022 · Updated Apr 23, 2025

Information disclosure in Jupyter Server before 1.17.1 allows remote authenticated users to obtain the server access token via its REST API. The contents handlers resolve direct paths to hidden runtime files without applying hidden-path checks, so a guessed server PID filename reveals its token. Exposure requires a root directory containing the server user's home directory; the token permits reading or overwriting files through Jupyter services.

CVSS severity8.8
High
EPSS probability0.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Jupyter Server before 1.17.1 allows remote authenticated users to obtain the server access token via its REST API. The contents handlers resolve direct paths to hidden runtime files without applying hidden-path checks, so a guessed server PID filename reveals its token. Exposure requires a root directory containing the server user's home directory; the token permits reading or overwriting files through Jupyter services.

The record

CVE
CVE-2022-29241
Published
Jun 14, 2022
Updated
Apr 23, 2025
Vendor
Project Jupyter
Product
Jupyter Server
Classifications
CWE-200, T1552.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 14, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 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.

  1. Affected versionversion=< 1.17.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Project Jupyter · Jupyter Serverversion=< 1.17.1

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.0NIST NVDAV:N/AC:L/Au:S/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1552.001Unsecured Credentials: Credentials In Files

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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