CVE-2025-52476Network attack vector

Browser script execution via unencoded hidden input

Published Mar 2, 2026 · Updated Mar 2, 2026

Reflected XSS in Chamilo LMS before 1.11.30 allows remote attackers to execute script in an administrator's browser via a crafted URL. admin/user_list.php passes keyword_active into SortableTable additional parameters, whose renderer concatenates the filtered value into a hidden input attribute instead of contextually encoding it. Exploitation requires an authenticated administrator to open the URL and invoke its access key; execution is limited to the Chamilo web origin.

CVSS severity5.1
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

Reflected XSS in Chamilo LMS before 1.11.30 allows remote attackers to execute script in an administrator's browser via a crafted URL. admin/user_list.php passes keyword_active into SortableTable additional parameters, whose renderer concatenates the filtered value into a hidden input attribute instead of contextually encoding it. Exploitation requires an authenticated administrator to open the URL and invoke its access key; execution is limited to the Chamilo web origin.

The record

CVE
CVE-2025-52476
Published
Mar 2, 2026
Updated
Mar 2, 2026
Vendor
Chamilo
Product
Chamilo LMS
Classifications
CWE-79, CWE-80, CWE-87, T1204.001
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

5.1GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
CWE-87Improper Neutralization of Alternate XSS Syntax
T1204.001Malicious Link

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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