CVE-2026-41180Public exploitNetwork attack vector

Restart-time code execution via decoded upload path

Published Apr 23, 2026 · Updated Apr 23, 2026

Path traversal in PsiTransfer before 2.4.3 allows remote attackers to write executable JavaScript through an upload PATCH request. The /files/:uploadId middleware checks the encoded request path, while the tus handler decodes the same identifier before resolving the write destination. Code execution occurs after a restart only when a custom upload-directory basename prefixes a startup-loaded configuration path.

CVSS severity7.5
High
EPSS probability0.31%
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 PsiTransfer before 2.4.3 allows remote attackers to write executable JavaScript through an upload PATCH request. The /files/:uploadId middleware checks the encoded request path, while the tus handler decodes the same identifier before resolving the write destination. Code execution occurs after a restart only when a custom upload-directory basename prefixes a startup-loaded configuration path.

The record

CVE
CVE-2026-41180
Published
Apr 23, 2026
Updated
Apr 23, 2026
Vendor
psi-4ward
Product
PsiTransfer
Classifications
CWE-22, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 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=< 2.4.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

psi-4ward · PsiTransferversion=< 2.4.3

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/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 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')
T1190Exploit Public-Facing Application

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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