Administrator takeover via Social Networks file upload
Published Mar 5, 2026 · Updated Mar 5, 2026
Stored XSS in Chamilo LMS before 1.11.34 allows remote authenticated users to take over administrator accounts through file uploads. The Social Networks upload path stores attacker-controlled files and renders active content in an administrator's inbox, executing JavaScript in the LMS origin. Low-privilege access is sufficient, but an authenticated administrator must view the malicious content; execution can expose the session and perform actions with administrator privileges.
Summary
What happened
Stored XSS in Chamilo LMS before 1.11.34 allows remote authenticated users to take over administrator accounts through file uploads. The Social Networks upload path stores attacker-controlled files and renders active content in an administrator's inbox, executing JavaScript in the LMS origin. Low-privilege access is sufficient, but an authenticated administrator must view the malicious content; execution can expose the session and perform actions with administrator privileges.
The record
- CVE
- CVE-2025-55208
- Published
- Mar 5, 2026
- Updated
- Mar 5, 2026
- Vendor
- Chamilo
- Product
- Chamilo LMS
- Classifications
- CWE-79, T1539
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 5, 2026CVE publishedPublication date reported by the CVE source.
- Mar 5, 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?
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- Affected versionversion=< 1.11.34
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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