High Threat Security Alert (A26-08-20): Multiple Vulnerabilities in Fortinet Products


 

Published on: 13 August 2026

Description:

Fortinet released security advisories to address multiple vulnerabilities in Fortinet systems. An attacker could exploit these vulnerabilities by sending specially crafted requests to an affected system.

Reports indicated that proof-of-concept (PoC) exploit code for a denial-of-service vulnerability (CVE-2026-49975, known as HTTP/2 Bomb) is publicly available and it is at high risk of exploitation. System administrators are advised to take immediate action to patch your affected systems to mitigate the elevated risk of cyber attacks.

 

Affected Systems:

  • FortiOS version 7.2 (all versions), version 7.4 (all versions), version 7.6.1 through 7.6.6
  • FortiWeb version 7.2 (all versions), version 7.4 (all versions), version 7.6.0 through 7.6.6, version 8.0.0 through 8.0.2
  • FortiManager version 7.2.5 through 7.2.9, version 7.4.3 through 7.4.5, version 7.6.1
  • FortiManager Cloud version 7.2.5 through 7.2.9, version 7.4.3 through 7.4.5, version 7.6.1
  • FortiClientWindows version 7.2.0 through 7.2.11, version 7.4.0 through 7.4.3
  • FortiProxy version 7.2 (all versions), version 7.4.0 through 7.4.14, version 7.6.0 through 7.6.6
  • FortiPAM version 1.0 (all versions), version 1.1 (all versions), version 1.2 (all versions), version 1.3 (all versions), version 1.4 (all versions), version 1.5 (all versions), version 1.6 (all versions), version 1.7 (all versions), version 1.8 (all versions), version 1.9.0 through 1.9.1
  • FortiSwitchManager version 7.2.0 through 7.2.9
  • FortiSIEM version 6.5 (all versions), version 6.6 (all versions), version 6.7 (all versions), version 7.0 (all versions), version 7.1 (all versions), version 7.2 (all versions), version 7.3.0 through 7.3.5, version 7.4.0 through 7.4.2, version 7.5.0

For detailed information of the affected products, please refer to the section "Affected Products" of corresponding security advisory at vendor's website.

 

Impact:

Successful exploitation of the vulnerabilities could lead to remote code execution, denial of service, elevation of privilege, security restriction bypass or spoofing on an affected system.

 

Recommendation:

Patches for affected systems are available. System administrators of affected systems should follow the recommendations provided by the vendor and take immediate actions to mitigate the risk.

 

More Information:

  • https://fortiguard.fortinet.com/psirt/FG-IR-26-156
  • https://fortiguard.fortinet.com/psirt/FG-IR-26-157
  • https://fortiguard.fortinet.com/psirt/FG-IR-26-158
  • https://fortiguard.fortinet.com/psirt/FG-IR-26-159
  • https://fortiguard.fortinet.com/psirt/FG-IR-26-160
  • https://fortiguard.fortinet.com/psirt/FG-IR-26-161
  • https://fortiguard.fortinet.com/psirt/FG-IR-26-162
  • https://fortiguard.fortinet.com/psirt/FG-IR-26-163
  • https://www.hkcert.org/security-bulletin/fortinet-products-multiple-vulnerabilities_20260813
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-26035
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-49975
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-70465 (to CVE-2026-70468)
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-71407 (to CVE-2026-71408)


Tag: Fortinet , FortiOS , FortiWeb , FortiManager , FortiClientWindows , FortiProxy , FortiPAM , FortiSwitchManager , FortiSIEM
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