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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.

PUBLISHED Reserved 2026-04-07 | Published 2026-04-22 | Updated 2026-04-22 | Assigner INCIBE




HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Problem types

CWE-306 Missing authentication for critical function

Product status

Default status
unaffected

5
affected

5.30.07
unaffected

Credits

Alejandro Rivera León finder

References

www.incibe.es/...ces/aviso/multiple-vulnerabilities-fullstep patch

cve.org (CVE-2026-5749)

nvd.nist.gov (CVE-2026-5749)

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