Cyber Resilience

CVE-2026-21741

Open Redirect in Fortinet Fortinac-F 7.2.0 – 7.6.6

Open Redirect
Published
14 April 2026
Modified
20 April 2026
Patch / advisory
View advisory
CVSS Score v3.1 2.4
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N
EPSS Score 0.0021 11th percentile
Risk Priority 22 floored blend · peak EPSS

Summary

CVE-2026-21741 is a low-severity Open Redirect (CWE-601) vulnerability in Fortinet Fortinac-F. Its CVSS base score is 2.4 (Low).

Operationally, exploitation aligns with the MITRE ATT&CK technique Phishing (T1566); ranked at the 11th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to SI-10 (Information Input Validation) and AC-4 (Information Flow Enforcement) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

A01:2025 Broken Access Control

EU & UK References

Vulnerability Data

An URL Redirection to Untrusted Site ('Open Redirect') vulnerability [CWE-601] vulnerability in Fortinet FortiNAC-F 7.6.0 through 7.6.5, FortiNAC-F 7.4 all versions, FortiNAC-F 7.2 all versions may allow a remote privileged attacker with system administrator role to redirect users to an…

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arbitrary website via crafted CSV file.

CWE(s)
CWE-601

Related Threats

MITRE ATT&CK Enterprise Techniques

T1566 Phishing Initial Access
Adversaries may send phishing messages to gain access to victim systems.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2025-47890Same vendor: Fortinet
CVE-2023-48785Same product: Fortinet Fortinac-F
CVE-2023-22641Same vendor: Fortinet
CVE-2024-23664Same vendor: Fortinet
CVE-2023-22637Same product: Fortinet Fortinac-F
CVE-2023-26203Same product: Fortinet Fortinac-F
CVE-2023-22633Same product: Fortinet Fortinac-F
CVE-2023-46750Shared CWE-601
CVE-2024-24764Shared CWE-601
CVE-2026-32113Shared CWE-601

Affected Assets

fortinet
fortinac-f
7.2.0 — 7.6.6

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V3.7.2

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match

Input validation directly checks and rejects untrusted redirect targets before they are used in a response.

AC-4 Information Flow Enforcement partial match

Information flow enforcement can restrict redirects to only approved/trusted destinations, stopping untrusted user-supplied URLs from being followed.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly require input validation and untrusted-redirect controls that prevent CWE-601.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.23 Web filtering partial match
mitigates

Preventing access to attacker-controlled or malicious sites stops users from being redirected to untrusted locations via open-redirect or phishing links.

References