CVE-2024-5520Network attack vector

Stored script execution via unescaped titles and SVGs

Published May 30, 2024 · Updated Aug 1, 2024

Stored XSS in Alkacon Software OpenCms 16 allows remote authenticated users to execute JavaScript through crafted site titles or SVG images. Site-management reports and delete confirmations insert site titles into HTML without XML escaping, while privileged image uploads accept active SVG content. An attacker needs page-management privileges for the title path or a gallery editor or VFS resource manager role for the SVG path, and the script runs in another user's browser.

CVSS severity6.4
Medium
EPSS probability0.28%
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 Alkacon Software OpenCms 16 allows remote authenticated users to execute JavaScript through crafted site titles or SVG images. Site-management reports and delete confirmations insert site titles into HTML without XML escaping, while privileged image uploads accept active SVG content. An attacker needs page-management privileges for the title path or a gallery editor or VFS resource manager role for the SVG path, and the script runs in another user's browser.

The record

CVE
CVE-2024-5520
Published
May 30, 2024
Updated
Aug 1, 2024
Vendor
Alkacon Software
Product
OpenCms
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 30, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 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=16

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Alkacon Software · OpenCmsversion=16

Published CVSS scores

6.4INCIBECVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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