Unauthenticated file disclosure via predictable user identifiers
Published Feb 3, 2026 · Updated Feb 3, 2026
Authorization bypass in Greek Universities Network Open eClass before 4.2 allows remote attackers to read other users' personal files. The /modules/document/file.php/user,/<file_name> endpoint accepts sequential user identifiers and file names from the URL, then returns the referenced file without authentication or authorization checks. A valid user identifier and file name must be requested, and successful exploitation discloses file contents without enabling modification or service interruption.
Summary
What happened
Authorization bypass in Greek Universities Network Open eClass before 4.2 allows remote attackers to read other users' personal files. The /modules/document/file.php/user,/<file_name> endpoint accepts sequential user identifiers and file names from the URL, then returns the referenced file without authentication or authorization checks. A valid user identifier and file name must be requested, and successful exploitation discloses file contents without enabling modification or service interruption.
The record
- CVE
- CVE-2026-24773
- Published
- Feb 3, 2026
- Updated
- Feb 3, 2026
- Vendor
- Greek Universities Network
- Product
- Open eClass
- Classifications
- CWE-639, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 3, 2026CVE publishedPublication date reported by the CVE source.
- Feb 3, 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=< 4.2
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
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- GHSA-63pm-pff4-xc9c unauthenticated file-access proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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