EUVD-2026-50126
GHSA-7q3f-f53f-7cpq
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Network endpoint, low complexity, any authenticated account (PR:L); full DB read plus token theft give C:H/I:H, no availability impact so A:N.
Primary rating from Vendor (CSA).
CVSS VectorVendor: CSA
Lifecycle Timeline
2DescriptionCVE.org
A post-authentication SQL injection vulnerability in Koollab LMS allowed an authenticated attacker to use an error-based SQL oracle via the face-to-face runs update endpoint to read the entire application database and obtain valid JWT tokens for account takeover.
AnalysisAI
Error-based SQL injection in Koollab LMS 5.3.2 lets an authenticated attacker abuse the face-to-face runs update endpoint as a SQL oracle to exfiltrate the entire application database, including valid JWT tokens that enable full account takeover. Rated CVSS 8.1 with high confidentiality and integrity impact; there is no public exploit identified at time of analysis and EPSS is low at 0.25% (17th percentile). SSVC scores technical impact as total but exploitation as none, indicating no observed use so far.
Technical ContextAI
Koollab LMS is a learning management system developed by Three Learning (CPE cpe:2.3:a:three_learning:koollab_lms). The flaw is a classic CWE-89 (Improper Neutralization of Special Elements used in an SQL Command) where user-controlled input to the face-to-face runs update endpoint is concatenated into a backend SQL query without proper parameterization. Because it is error-based, the attacker does not need direct data return in the response; instead they coerce the database engine into emitting distinguishable error states (a 'SQL oracle') that leak data one condition at a time. The high-value target here is stored JWT token/session material, whose disclosure permits authentication bypass and account takeover.
RemediationAI
No vendor-released patch version is identified at time of analysis; the available references (CSA advisory AL-2026-094 at https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2026-094/ and the NVD record at https://nvd.nist.gov/vuln/detail/CVE-2026-63231) do not cite a fixed release, so upgrade to a vendor-supplied fixed build of Koollab LMS as soon as Three Learning publishes one and monitor those advisories. In the interim apply specific compensating controls: restrict access to the face-to-face runs update endpoint at the application or reverse-proxy/WAF layer with SQLi signatures targeting error-based payloads (trade-off: WAF rules can be bypassed and may block legitimate content); tighten account provisioning and disable or audit self-service and stale accounts to raise the PR:L barrier (trade-off: administrative overhead); and, because JWT tokens can be stolen, rotate the JWT signing secret and shorten token lifetimes so any leaked tokens expire quickly (trade-off: forces user re-authentication). Enable database query logging on the affected endpoint to detect oracle-style probing.
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External POC / Exploit Code
Leaving vuln.today