CVE-2023-44763Public exploitNetwork attack vector

Stored XSS via crafted thumbnail upload

Published Oct 10, 2023 · Updated Aug 2, 2024

Stored XSS in Concrete CMS 9.2.1 allows remote authenticated users to execute scripts through a crafted PDF thumbnail upload. The Thumbnail upload accepts a PDF containing embedded JavaScript and serves a link that executes the payload when opened. Administrator upload access and victim interaction are required; the vendor disputes the issue and treats allowed file types as site configuration.

CVSS severity5.4
Medium
EPSS probability0.58%
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 Concrete CMS 9.2.1 allows remote authenticated users to execute scripts through a crafted PDF thumbnail upload. The Thumbnail upload accepts a PDF containing embedded JavaScript and serves a link that executes the payload when opened. Administrator upload access and victim interaction are required; the vendor disputes the issue and treats allowed file types as site configuration.

The record

CVE
CVE-2023-44763
Published
Oct 10, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-434, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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.

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
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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