CVE-2026-33588Public exploitNetwork attack vector

Authenticated arbitrary file write via unsanitized filename

Published May 7, 2026 · Updated May 7, 2026

Path traversal in Open Notebook 1.8.3 and earlier allows remote authenticated users to write arbitrary files in its Docker container. The upload endpoint uses the supplied filename as a path without sanitizing it or confirming that the resolved destination remains under the upload directory. Any application account that can upload a file can overwrite application-accessible code or configuration, interrupting service or enabling a web shell.

CVSS severity7.0
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Open Notebook 1.8.3 and earlier allows remote authenticated users to write arbitrary files in its Docker container. The upload endpoint uses the supplied filename as a path without sanitizing it or confirming that the resolved destination remains under the upload directory. Any application account that can upload a file can overwrite application-accessible code or configuration, interrupting service or enabling a web shell.

The record

CVE
CVE-2026-33588
Published
May 7, 2026
Updated
May 7, 2026
Vendor
Open Notebook
Product
Open Notebook
Classifications
CWE-20, CWE-22, T1105
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 7, 2026CVE publishedPublication date reported by the CVE source.
  2. May 7, 2026Record 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=0 <=1.8.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Open Notebook · Open Notebookversion=0 <=1.8.3

Published CVSS scores

8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
7.0ENISACVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
8.1Open NotebookCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

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 exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1105Ingress Tool Transfer

Public exploit references

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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