CVE-2025-59540Network attack vector

Admin session compromise via stored exercise feedback

Published Mar 6, 2026 · Updated Mar 6, 2026

Stored XSS in Chamilo LMS before 1.11.34 allows remote authenticated users to execute JavaScript in an administrator's browser. The exercise-history feedback path stores staff-supplied text and later renders it without sufficient output encoding, so embedded script persists in the database and runs when the history is viewed. A staff account and an administrator viewing the affected history are required; successful execution can expose the administrator's session and enable actions under that session.

CVSS severity6.4
Medium
EPSS probability0.18%
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 Chamilo LMS before 1.11.34 allows remote authenticated users to execute JavaScript in an administrator's browser. The exercise-history feedback path stores staff-supplied text and later renders it without sufficient output encoding, so embedded script persists in the database and runs when the history is viewed. A staff account and an administrator viewing the affected history are required; successful execution can expose the administrator's session and enable actions under that session.

The record

CVE
CVE-2025-59540
Published
Mar 6, 2026
Updated
Mar 6, 2026
Vendor
Chamilo
Product
Chamilo LMS
Classifications
CWE-79, CWE-80, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 6, 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=< 1.11.34

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Chamilo · Chamilo LMSversion=< 1.11.34

Published CVSS scores

6.4GitHub CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H

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
Privilegesauthenticated
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)
T1059.007JavaScript/JScript

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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