CVE-2026-5749

High

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.

SeverityHigh

CVSS8.7

Exploit probability—

ProductFullstep

PublishedApr 22, 2026

First seenApr 22, 2026

Weakness typeCWE-306Missing authentication for critical function

How to fix

Patches

incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-fullstep

Affected products

Product	Affected versions	Fixed in
Fullstep Fullstep	5	—

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