CVE-2026-5436Network attack vector

Unauthenticated arbitrary file move via absolute paths

Published Apr 8, 2026 · Updated Apr 8, 2026

Path traversal in MW WP Form 5.1.1 and earlier allows remote attackers to move arbitrary server files through a crafted form submission. generate_user_file_dirpath() passes the attacker-controlled upload-field key to path_join(), which preserves an absolute path instead of the intended temporary-directory base. Exploitation requires a form with a file-upload field and inquiry-data storage enabled; rename() then relocates the selected file into uploads, enabling file disclosure or code execution depending on the file.

CVSS severity8.1
High
EPSS probability1.07%
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 MW WP Form 5.1.1 and earlier allows remote attackers to move arbitrary server files through a crafted form submission. generate_user_file_dirpath() passes the attacker-controlled upload-field key to path_join(), which preserves an absolute path instead of the intended temporary-directory base. Exploitation requires a form with a file-upload field and inquiry-data storage enabled; rename() then relocates the selected file into uploads, enabling file disclosure or code execution depending on the file.

The record

CVE
CVE-2026-5436
Published
Apr 8, 2026
Updated
Apr 8, 2026
Vendor
Takashi Kitajima
Product
MW WP Form
Classifications
CWE-22, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 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 <=5.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Takashi Kitajima · MW WP Formversion=0 <=5.1.1

Published CVSS scores

8.1WordfenceCVSS:3.1/AV:N/AC:H/PR:N/UI:N/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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