CVE-2026-22810Public exploit

Arbitrary file overwrite via unsanitized attachment names

Published May 18, 2026 · Updated May 18, 2026

Path traversal in Joplin 3.2.2 through 3.5.6 allows context-dependent attackers to overwrite arbitrary files via a crafted OneNote export. The OneNote converter's embedded_file.rs passes an attachment name containing ../ through determine_filename and joins it to the extraction directory before writing. A user must import the malicious file; file overwrite is demonstrated, while code execution requires targeting a file processed by another component.

CVSS severity8.2
High
EPSS probability0.21%
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 Joplin 3.2.2 through 3.5.6 allows context-dependent attackers to overwrite arbitrary files via a crafted OneNote export. The OneNote converter's embedded_file.rs passes an attachment name containing ../ through determine_filename and joins it to the extraction directory before writing. A user must import the malicious file; file overwrite is demonstrated, while code execution requires targeting a file processed by another component.

The record

CVE
CVE-2026-22810
Published
May 18, 2026
Updated
May 18, 2026
Vendor
Joplin Project
Product
Joplin
Classifications
CWE-24, T1204.002
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. May 18, 2026CVE publishedPublication date reported by the CVE source.
  2. May 18, 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=< 3.5.7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Joplin Project · Joplinversion=< 3.5.7

Published CVSS scores

8.2GitHubCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-24Path Traversal: '../filedir'
T1204.002Malicious File

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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