CVE-2025-27409Public exploitNetwork attack vector

Arbitrary file read via unchecked plugin asset paths

Published Apr 30, 2025 · Updated Apr 30, 2025

Path traversal in Joplin Server before 3.3.3 allows remote attackers to read arbitrary server files through plugin asset URLs. The default route's findLocalFile function returns a path produced by localFileFromUrl for css/pluginAssets or js/pluginAssets prefixes without rejecting traversal segments. No authentication or user interaction is required, and successful requests disclose files readable by the server process.

CVSS severity7.5
High
EPSS probability0.62%
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 Server before 3.3.3 allows remote attackers to read arbitrary server files through plugin asset URLs. The default route's findLocalFile function returns a path produced by localFileFromUrl for css/pluginAssets or js/pluginAssets prefixes without rejecting traversal segments. No authentication or user interaction is required, and successful requests disclose files readable by the server process.

The record

CVE
CVE-2025-27409
Published
Apr 30, 2025
Updated
Apr 30, 2025
Vendor
Joplin Project
Product
Joplin
Classifications
CWE-22, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 30, 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=< 3.3.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Joplin Project · Joplinversion=< 3.3.3

Published CVSS scores

7.5GitHub CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1005Data from Local System

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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