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CVE-2021-26103

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-12-08 · updated 2026-06-17
• Weakness: CWE-345

Description

An insufficient verification of data authenticity vulnerability (CWE-345) in the user interface of FortiProxy verison 2.0.3 and below, 1.2.11 and below and FortiGate verison 7.0.0, 6.4.6 and below, 6.2.9 and below of SSL VPN portal may allow a remote, unauthenticated attacker to conduct a cross-site request forgery (CSRF) attack . Only SSL VPN in web mode or full mode are impacted by this vulnerability.

Affected products

• Fortinet FortiOS (FortiGate): from 5.6.0 through 5.6.14; from 6.0.0 through 6.0.13; from 6.2.0 through 6.2.9; from 6.4.0 through 6.4.6; 7.0.0
• Fortinet FortiProxy: from 1.2.0 through 1.2.11; from 2.0.0 through 2.0.3

References

• https://fortiguard.com/advisory/FG-IR-20-158
• https://fortiguard.com/advisory/FG-IR-20-158

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