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CVE-2026-63234 is a critical post-authentication vulnerability in Three Learning Koollab LMS 5.3.2 that combines SQL injection with unsafe deserialization in the manual mark assessment endpoint. An authenticated attacker can inject crafted input through this endpoint and influence data subsequently passed to PHP unserialize(), creating a deserialization chain that enables arbitrary file write behavior. Successful exploitation allows the attacker to place a server-executable webshell in a publicly accessible location and then execute arbitrary code on the application server. The issue is network exploitable, requires low privileges, and does not require user interaction.
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What an attacker gets, and what they’ve been doing with it.
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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 deserialisation that can let an authenticated attacker write a webshell and achieve arbitrary code execution on the server.
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.