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Vulnerability record · CVE-2026-26035 · published 12 August 2026

CVE-2026-26035: Fortinet fortiweb improper authentication vulnerability

Fortinet · Fortiweb

An Improper Authentication vulnerability [CWE-287] vulnerability in Fortinet FortiWeb 8.0.0 through 8.0.2, FortiWeb 7.6.0 through 7.6.6, FortiWeb 7.4.0 through 7.4.11, FortiWeb 7.2.0 through 7.2.12, FortiWeb 7.0.0 through 7.0.12 may allow a remote unauthenticated attacker to login into the Fortiweb GUI/CLI with a random username and password

9.8 CVSS 3.1 Critical EPSS 0.75% · top 46.9% CWE-287 · Improper authentication
9.8CVSS 3.1 base score
0.75%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
8 Sep 2026Last modified by NVD

Description

An Improper Authentication vulnerability [CWE-287] vulnerability in Fortinet FortiWeb 8.0.0 through 8.0.2, FortiWeb 7.6.0 through 7.6.6, FortiWeb 7.4.0 through 7.4.11, FortiWeb 7.2.0 through 7.2.12, FortiWeb 7.0.0 through 7.0.12 may allow a remote unauthenticated attacker to login into the Fortiweb GUI/CLI with a random username and password

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://fortiguard.fortinet.com/psirt/FG-IR-26-158 Vendor AdvisoryMitigation

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-24858Fortinet FortiCloud SSO authentication bypass across registered devicesA CWE-288 authentication bypass in Fortinet FortiAnalyzer, FortiManager, FortiNAC-F, FortiOS, FortiProxy and FortiWeb lets an attacker with a FortiCl…KEVEPSS 86%analysed9.8CVE-2025-64446FortiWeb relative path traversal allows admin command executionFortiWeb contains a relative path traversal flaw (CWE-23) reachable through crafted HTTP or HTTPS requests. Successful exploitation lets an attacker …KEVEPSS 92%analysed9.8CVE-2025-25257FortiWeb unauthenticated SQL injection via HTTP requestsFortiWeb versions 7.0.0 through 7.6.3 contain a CWE-89 SQL injection flaw that lets an unauthenticated attacker run unauthorized SQL code or commands…KEVEPSS 100%analysed7.2CVE-2025-58034FortiWeb OS command injection via crafted HTTP or CLI inputFortiWeb versions 7.0.0 through 8.0.1 contain an OS command injection flaw (CWE-78) that lets an authenticated attacker run unauthorized code on the …KEVEPSS 56%analysed9.8CVE-2025-59719Fortinet fortiweb improper verification of cryptographic signature vulnerabilityAn improper verification of cryptographic signature vulnerability in Fortinet FortiWeb 8.0.0, FortiWeb 7.6.0 through 7.6.4, FortiWeb 7.4.0 through 7.…EPSS 29%9.8CVE-2023-25610Fortinet fortiweb vulnerabilityA buffer underwrite ('buffer underflow') vulnerability in the administrative interface of Fortinet FortiOS version 7.2.0 through 7.2.3, version 7.0.0…EPSS 18%9.8CVE-2024-55594Fortinet fortiweb vulnerabilityAn improper handling of syntactically invalid structure in Fortinet FortiWeb at least vesrions 7.4.0 through 7.4.6 and 7.2.0 through 7.2.10 and 7.0.0…EPSS 0.52%9.8CVE-2023-42784Fortinet fortiweb vulnerabilityAn improper handling of syntactically invalid structure in Fortinet FortiWeb at least verions 7.4.0 through 7.4.6 and 7.2.0 through 7.2.10 and 7.0.0 …EPSS 0.38%

Source: NIST National Vulnerability Database (record CVE-2026-26035), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.