CVE-2021-4225Public exploitNetwork attack vector

Authenticated code execution via trailing-dot upload bypass

Published Apr 25, 2022 · Updated Aug 3, 2024

Arbitrary file upload in Smarty Pants Plugins SP Project & Document Manager before 4.24 allows remote authenticated users to execute PHP code. On Windows hosts, the upload filter accepts a filename ending in .php.; Windows removes the trailing dot when storing it as executable .php. Subscriber access and a configured plugin upload page are sufficient to place and request a web shell under the WordPress uploads directory.

CVSS severity8.8
High
EPSS probability1.72%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file upload in Smarty Pants Plugins SP Project & Document Manager before 4.24 allows remote authenticated users to execute PHP code. On Windows hosts, the upload filter accepts a filename ending in .php.; Windows removes the trailing dot when storing it as executable .php. Subscriber access and a configured plugin upload page are sufficient to place and request a web shell under the WordPress uploads directory.

The record

CVE
CVE-2021-4225
Published
Apr 25, 2022
Updated
Aug 3, 2024
Vendor
Smarty Pants Plugins
Product
SP Project & Document Manager
Classifications
CWE-434, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 25, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=4.24 <4.24

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Smarty Pants Plugins · SP Project & Document Managerversion=4.24 <4.24

Published CVSS scores

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

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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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