CVE-2026-5749 Inadequate access control vulnerability in Fullstep
Unauthenticated attackers can obtain valid JWT tokens via inadequate registration access control, allowing unauthorized access to protected API resources.
- 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-2026-5749?
CVE-2026-5749 is a high-severity authentication bypass vulnerability in Fullstep, published on 22 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Inadequate access control in the registration process in Fullstep V5, which could allow unauthenticated users to obtain a valid JWT token with which to interact with authenticated API resources. Successful exploitation of this vulnerability could allow an unauthenticated attacker to compromise the confidentiality of the affected resource, provided they have a valid token with which to interact with the API.
Weakness: CWE-306
Which versions are affected by CVE-2026-5749?
How do I fix CVE-2026-5749?
No fix has been published for CVE-2026-5749 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-2026-5749 being exploited?
There is no known exploitation of CVE-2026-5749 in the wild and no public exploit code.
Sources
Also known as GHSA-c4hv-pjjq-493x.