Authentication bypass by spoofing in FortiWeb - CVE-2025-48840

 

Authentication bypass by spoofing in FortiWeb - CVE-2025-48840

Published: March 10, 2026


Vulnerability identifier: #VU123728
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-48840
CWE-ID: CWE-290
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to bypass hostname restrictions.

The vulnerability exists due to improper validation of user-supplied input. A remote attacker can perform spoofing attack and bypass hostname restrictions.


Affected software

FortiWeb

How to mitigate CVE-2025-48840

Install updates from vendor's website.

FortiWeb - addressed in versions 7.4.9, 7.6.4

External References

Related Security Bulletins