Vulnerability · Published Apr 22, 2026 · Assigned by INCIBE

CVE-2026-5750Insecure direct object reference (IDOR) vulnerability in Fullstep

High 7.6

In plain English

A high-severity authorization bypass via user-controlled key in Fullstep from Fullstep. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities).

Severity (CVSS 4.0)7.6High

Exploit odds (30 days)0.2%top 89.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

An insecure direct object reference (IDOR) vulnerability in the Fullstep V5 registration process allows authenticated users to access data belonging to other registered users through various vulnerable authenticated resources in the application. The vulnerable endpoints result from: '/api/suppliers/v1/suppliers//false' to list user information; and '/#/supplier-registration/supplier-registration//2' to update your user information (personal details, documents, etc.).

Affected products (as reported)

Vendor	Product	Versions
Fullstep	Fullstep	5

Weakness: CWE-639 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

References

https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-fullstep patch