CVE-2025-59543Network attack vector

Account takeover via unencoded course description title

Published Mar 6, 2026 · Updated Mar 6, 2026

Stored XSS in Chamilo LMS before 1.11.34 allows remote authenticated users to hijack privileged accounts via course descriptions. The course information renderer inserts a stored course-description title into HTML without output encoding, so script runs when another user opens the page. Trainer-level access is sufficient to store the payload, but a victim must view the course information page; script execution in that victim's browser can expose session cookies or tokens and enable account takeover.

CVSS severity9.0
Critical
EPSS probability0.25%
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 hijack privileged accounts via course descriptions. The course information renderer inserts a stored course-description title into HTML without output encoding, so script runs when another user opens the page. Trainer-level access is sufficient to store the payload, but a victim must view the course information page; script execution in that victim's browser can expose session cookies or tokens and enable account takeover.

The record

CVE
CVE-2025-59543
Published
Mar 6, 2026
Updated
Mar 6, 2026
Vendor
Chamilo
Product
Chamilo LMS
Classifications
CWE-79, T1539
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

9.0GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A: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.

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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')
T1539Steal Web Session Cookie

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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