Authenticated code execution via SQL-fed unsafe deserialization
Published Jul 29, 2026 · Updated Jul 29, 2026
SQL injection and unsafe deserialization in Three Learning Koollab LMS 5.3.2 allows remote authenticated users to execute server code. The assessment overall answer endpoint accepts injected SQL that controls data passed to unserialize(), enabling a webshell write to a public path. Any authenticated account can reach the network endpoint and use the written webshell for arbitrary server-side code execution.
Summary
What happened
SQL injection and unsafe deserialization in Three Learning Koollab LMS 5.3.2 allows remote authenticated users to execute server code. The assessment overall answer endpoint accepts injected SQL that controls data passed to unserialize(), enabling a webshell write to a public path. Any authenticated account can reach the network endpoint and use the written webshell for arbitrary server-side code execution.
The record
- CVE
- CVE-2026-63233
- Published
- Jul 29, 2026
- Updated
- Jul 29, 2026
- Vendor
- Three Learning
- Product
- Koollab LMS
- Classifications
- CWE-89, T1505.003, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 29, 2026CVE publishedPublication date reported by the CVE source.
- Jul 29, 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=5.3.2
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
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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