CVE-2026-18080Network attack vector

Arbitrary PHP upload via traversing IMAP attachment names

Published Aug 26, 2026 · Updated Aug 26, 2026

Unrestricted file upload in WP ERP 1.17.8 and earlier allows remote attackers to write PHP files through crafted inbound email attachments. The CRM Email Connect save_attachments() function accepts attachment filenames without extension validation or path normalization, allowing traversal outside crm-attachments into wp-content/uploads/. The CRM module and configured IMAP Email Connect feature are required, and code execution follows only where uploads execute PHP.

CVSS severity9.8
Critical
EPSS probability0.67%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in WP ERP 1.17.8 and earlier allows remote attackers to write PHP files through crafted inbound email attachments. The CRM Email Connect save_attachments() function accepts attachment filenames without extension validation or path normalization, allowing traversal outside crm-attachments into wp-content/uploads/. The CRM module and configured IMAP Email Connect feature are required, and code execution follows only where uploads execute PHP.

The record

CVE
CVE-2026-18080
Published
Aug 26, 2026
Updated
Aug 26, 2026
Vendor
HappyMonster
Product
WP ERP
Classifications
CWE-434, T1505.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 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 <=1.17.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

HappyMonster · WP ERPversion=0 <=1.17.8

Published CVSS scores

9.8WordfenceCVSS:3.1/AV:N/AC:L/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-434Unrestricted Upload of File with Dangerous Type
T1505.003Web Shell

Public exploit references

No public exploit references are available in this record.

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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