PT-2026-22945 · Fortinet · Fortinet Fortigate

Published 2026-03-04 · Updated 2026-03-10 · CVE-2026-23811

Positive Technologies (AI Summary)

CVSS v3.1

4.3

Medium

Base vector

AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Name of the Vulnerable Software and Affected Versions (affected versions not specified)

Description A flaw exists in the client isolation mechanism that could allow an attacker to circumvent Layer 2 (L2) communication limitations between clients, potentially redirecting traffic at Layer 3 (L3). Exploitation, combined with a port-stealing attack, may enable a bi-directional Machine-in-the-Middle (MitM) attack, bypassing policy enforcement.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Weakness Enumeration

CWE-300

Related Identifiers

CVE-2026-23811

Affected Products

Fortinet Fortigate

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-23811 · Security Note
• https://support.hpe.com/hpesc/public/docDisplay?docId=hpesbnw05026en_us&docLocale=en_US · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-23811 · Vendor Advisory
• https://twitter.com/CVEnew/status/2029272841141531133 · Twitter Post
• https://twitter.com/dailycve/status/2031173269861138765 · Twitter Post