CVE-2025-48840 Auth bypass in FortiWeb

What is CVE-2025-48840?

CVE-2025-48840 is a medium-severity authentication bypass vulnerability in Fortinet Fortiweb, published on 10 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An authentication bypass by spoofing vulnerability in Fortinet FortiWeb 7.6.0 through 7.6.3, FortiWeb 7.4.0 through 7.4.8, FortiWeb 7.2 all versions, FortiWeb 7.0 all versions may allow a remote unauthenticated attacker to bypass hostname restrictions via a specially crafted request.

Weakness: CWE-290

Which versions are affected by CVE-2025-48840?

It affects 1 product.

Products include Fortinet Fortiweb.

How do I fix CVE-2025-48840?

No fix has been published for CVE-2025-48840 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-2025-48840 being exploited?

There is no known exploitation of CVE-2025-48840 in the wild and no public exploit code.

Other vulnerabilities in Fortinet Fortiweb

• CVE-2025-25257 Fortinet FortiWeb SQL Injection Exploited Critical 9.6
• CVE-2025-64446 Fortinet FortiWeb Path Traversal Exploited Critical 9.4
• CVE-2025-58034 Fortinet FortiWeb OS Command Injection Exploited Medium 6.7
• CVE-2020-29015 SQL injection in Fortinet FortiWeb Critical 9.8
• CVE-2020-29016 Memory corruption in Fortinet FortiWeb Critical 9.8

All Fortinet Fortiweb vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-h6v5-rj27-w97h.