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CVE-2026-63232 is a critical post-authentication vulnerability in Three Learning Koollab LMS 5.3.2 that combines SQL injection with unsafe deserialization in the assessment reinforcement endpoint. An authenticated attacker can inject through this endpoint and influence application data that is subsequently passed to PHP unserialize(). By controlling the deserialized data, the attacker can cause the application to write a webshell to a publicly accessible location and then execute arbitrary code on the server. The issue therefore represents an exploit chain in which a database injection condition is used to reach unsafe object deserialization and ultimately server-side code execution.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability in Three Learning Koollab LMS 5.3.2 combining SQL injection and unsafe deserialization that allows an authenticated attacker to achieve arbitrary code execution by controlling data passed to unserialize() and writing a webshell.
A SQL injection and unsafe deserialisation vulnerability in Koollab LMS that allows an authenticated attacker to control data passed to unserialize(), write a webshell, and execute arbitrary code on the server.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.