CVE-2026-39811 Integer overflow in FortiWeb
An integer overflow in Fortinet FortiWeb allows attackers to cause a denial of service, requiring administrators to upgrade to patched versions.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-39811?
CVE-2026-39811 is a medium-severity vulnerability in Fortinet Fortiweb, published on 14 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
A integer overflow or wraparound vulnerability in Fortinet FortiWeb 8.0.0 through 8.0.3, FortiWeb 7.6.0 through 7.6.6, FortiWeb 7.4 all versions, FortiWeb 7.2 all versions, FortiWeb 7.0 all versions may allow attacker to denial of service via <insert attack vector here>
Weakness: CWE-190
Which versions are affected by CVE-2026-39811?
It affects 1 product.
Products include Fortinet Fortiweb.
How do I fix CVE-2026-39811?
No fix has been published for CVE-2026-39811 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-39811 being exploited?
There is no known exploitation of CVE-2026-39811 in the wild and no public exploit code.
Other vulnerabilities in Fortinet Fortiweb
Sources
Also known as GHSA-vf2h-7fg9-fhfj.