Username disclosure via distinguishable account responses
Published Mar 16, 2026 · Updated Mar 16, 2026
User enumeration in Chamilo LMS before 1.11.36 allows remote attackers to identify valid usernames through distinguishable responses. The request-response handling produces observably different results for valid and invalid usernames, although the vendor has not disclosed the affected endpoint or code path. No authentication or user interaction is required; exploitation requires a reachable affected workflow and reveals only whether tested usernames exist.
Summary
What happened
User enumeration in Chamilo LMS before 1.11.36 allows remote attackers to identify valid usernames through distinguishable responses. The request-response handling produces observably different results for valid and invalid usernames, although the vendor has not disclosed the affected endpoint or code path. No authentication or user interaction is required; exploitation requires a reachable affected workflow and reveals only whether tested usernames exist.
The record
- CVE
- CVE-2026-30876
- Published
- Mar 16, 2026
- Updated
- Mar 16, 2026
- Vendor
- Chamilo
- Product
- Chamilo LMS
- Classifications
- CWE-204, T1589.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 16, 2026CVE publishedPublication date reported by the CVE source.
- Mar 16, 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.
- Affected versionversion=< 1.11.36
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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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