CVE-2013-3591Public exploitNetwork attack vector

Authenticated code execution via unrestricted PHP upload

Published Feb 7, 2020 · Updated Aug 6, 2024

Unrestricted file upload in Vtiger CRM 5.3 and 5.4 allows remote authenticated users to execute arbitrary PHP code via Documents. The KCFinder upload handler accepts a .php3 payload into the web-accessible test/upload/files directory without rejecting executable PHP types. A valid CRM account and direct HTTP access to the uploaded file are required; successful exploitation runs code with the web server's privileges.

CVSS severity8.8
High
EPSS probability43.10%
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 Vtiger CRM 5.3 and 5.4 allows remote authenticated users to execute arbitrary PHP code via Documents. The KCFinder upload handler accepts a .php3 payload into the web-accessible test/upload/files directory without rejecting executable PHP types. A valid CRM account and direct HTTP access to the uploaded file are required; successful exploitation runs code with the web server's privileges.

The record

CVE
CVE-2013-3591
Published
Feb 7, 2020
Updated
Aug 6, 2024
Vendor
Vtiger
Product
Vtiger CRM
Classifications
CWE-434, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 7, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 2024Record 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=5.3
  2. Affected versionversion=5.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Vtiger · Vtiger CRMversion=5.3; version=5.4

Published CVSS scores

6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
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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