CVE-2026-63238 Authentication bypass vulnerability
Unauthenticated attackers can take over any account, including administrators, by exploiting a flaw in the 2FA validation endpoint.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-63238?
CVE-2026-63238 is a medium-severity authentication bypass vulnerability in Three Learning Koollab LMS, published on 29 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An 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.
Weakness: CWE-287
Which versions are affected by CVE-2026-63238?
How do I fix CVE-2026-63238?
No fix has been published for CVE-2026-63238 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-63238 being exploited?
There is no known exploitation of CVE-2026-63238 in the wild and no public exploit code.
Sources
Also known as GHSA-2g2j-fq65-5w72.