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CVE-2026-26035

Fortinet FortiWeb authentication bypass

9.8 CRITICALEPSS 0.75%
  1. Published12 Aug 2026

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 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Fortinet FortiWeb≥ 7.2.0 < 7.2.13 · ≥ 7.4.0 < 7.4.12 · ≥ 7.6.0 < 7.6.7 · ≥ 8.0.0 < 8.0.3

Remediation

Fixed in
Fortinet FortiWeb≥ 7.2.13

References

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Frequently asked

Is CVE-2026-26035 being actively exploited?

CVE-2026-26035 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.75%.

How severe is CVE-2026-26035?

CVE-2026-26035 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.75% probability of exploitation.

Which products are affected by CVE-2026-26035?

Affected products include Fortinet FortiWeb.

How do I fix CVE-2026-26035?

Upgrade affected software to a fixed version, for example Fortinet FortiWeb 7.2.13 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-26035 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.