CVE-2023-43872Public exploitNetwork attack vector

Stored XSS via unsanitized PDF upload

Published Sep 28, 2023 · Updated Sep 23, 2024

Stored XSS in CMS Made Simple 2.2.18 allows remote authenticated users to run script in another user's browser via an uploaded PDF. The File Manager upload path accepts a PDF containing embedded script without neutralizing that active content, then serves the file so the script executes when opened. Exploitation requires panel access to upload the file and user interaction to open it, exposing browser-accessible data or actions in the victim's session.

CVSS severity5.4
Medium
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in CMS Made Simple 2.2.18 allows remote authenticated users to run script in another user's browser via an uploaded PDF. The File Manager upload path accepts a PDF containing embedded script without neutralizing that active content, then serves the file so the script executes when opened. Exploitation requires panel access to upload the file and user interaction to open it, exposing browser-accessible data or actions in the victim's session.

The record

CVE
CVE-2023-43872
Published
Sep 28, 2023
Updated
Sep 23, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 28, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 23, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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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