Authentication bypass vulnerability

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-63238
StatePUBLISHED
AssignerCSA
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-29 07:16:43 UTC
Updated2026-07-30 16:54:05 UTC
DescriptionAn authentication bypass vulnerability in Koollab LMS allowed an unauthenticated attacker to take over any account, including administrator accounts, by supplying a valid user UUID without providing primary credentials via the 2FA validation endpoint.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from 5f57b9bf-260d-4433-bf07-b6a79e9bb7d4

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

EPSS: 0.002160000 probability, percentile 0.121880000 (date 2026-07-31)

Problem Types: CWE-287 | CWE-287 CWE-287 Improper Authentication

VersionSourceTypeScoreSeverityVector
3.15f57b9bf-260d-4433-bf07-b6a79e9bb7d4Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
3.1CNACVSS6.5MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Three Learning Koollab LMS affected 5.3.2 Not specified

References

ReferenceSourceLinkTags
www.csa.gov.sg/alerts-and-advisories/alerts/al-2026-094 5f57b9bf-260d-4433-bf07-b6a79e9bb7d4 www.csa.gov.sg
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