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CVE-2026-26035

Published: Aug 12, 2026Updated: Aug 13, 2026 Sources: CVE List NVDCWE-287
9.8CRITICAL
NVD MITRE
EPSS Score
0.5%
Top 58.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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

In plain language

AI Act now

Fortinet FortiWeb has a login-check flaw that lets an attacker access the admin interface with any username and password—so a typical small business should treat this as urgent if FortiWeb’s management console is reachable from the network.

Executive summary

Fortinet FortiWeb is vulnerable to an Improper Authentication issue (CWE-287) that allows unauthenticated remote attackers to bypass login checks and gain full administrative control over the device by attempting management-console access with arbitrary credentials.

If affected, business impact
Full administrative takeoverService disruption riskCompromise of web trafficPotential ransomware leverage

What to do now

  1. Check your FortiWeb version and whether the FortiWeb management interface (GUI and/or CLI) is reachable from the internet or other external networks.
  2. If you are on FortiWeb 8.0.0–8.0.2, upgrade to FortiWeb 8.0.3 or above.
  3. If you are on FortiWeb 7.6.0–7.6.6, upgrade to FortiWeb 7.6.7 or above.
  4. If you are on FortiWeb 7.4.0–7.4.11, upgrade to FortiWeb 7.4.12 or above.
  5. If you are on FortiWeb 7.2.0–7.2.12 or 7.0.0–7.0.12, upgrade to the upcoming FortiWeb 7.2.13 or 7.0.13 or above as directed by Fortinet.
  6. If you cannot upgrade immediately, restrict network access so the management interface is not reachable from untrusted networks (for example, block external access and allow only from your admin network).
Some work to apply

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-287

Affected Products

Fortinet
commercial·USaka forti net
FortiWeb
Security Products

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-26035?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

https://fortiguard.fortinet.com/psirt/FG-IR-26-158
fortiguard.fortinet.com
News mentions
2

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