CVE-2025-52564Network attack vector

HTML injection via unrestricted help topic

Published Mar 2, 2026 · Updated Mar 2, 2026

HTML injection in Chamilo LMS before 1.11.30 allows remote attackers to alter rendered help-page content via a crafted open parameter. The main/help/help.php handler passes the open value through Security::remove_XSS but does not restrict the surviving value to recognized help-topic identifiers. No authentication is required; the demonstrated consequence is arbitrary HTML rendering, while script execution is not confirmed.

CVSS severity6.9
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTML injection in Chamilo LMS before 1.11.30 allows remote attackers to alter rendered help-page content via a crafted open parameter. The main/help/help.php handler passes the open value through Security::remove_XSS but does not restrict the surviving value to recognized help-topic identifiers. No authentication is required; the demonstrated consequence is arbitrary HTML rendering, while script execution is not confirmed.

The record

CVE
CVE-2025-52564
Published
Mar 2, 2026
Updated
Mar 2, 2026
Vendor
Chamilo
Product
Chamilo LMS
Classifications
CWE-80
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 2, 2026Record 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=< 1.11.30

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Chamilo · Chamilo LMSversion=< 1.11.30

Published CVSS scores

6.9GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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