Fortinet Patches Authentication Flaws in FortiWeb and FortiManager

Fortinet on Wednesday announced patches for eight vulnerabilities across its products, including high-severity authentication bugs in FortiWeb and FortiManager. In FortiWeb, the company resolved an improper authentication issue impacting deployments configured with specific, non-default settings. A remote, unauthenticated attacker could exploit the flaw, tracked as CVE-2026-26035, “to log in to the FortiWeb GUI/CLI with a random username and password,” Fortinet explains. The weakness is associated with the wildcard setting for administrator accounts, which is disabled by default. When it is enabled, the system will match any username on a remote server with the Remote User account. “When wildcard is enabled, and if you have defined a group name in the Admin User Group (User > User Group > Admin Group), then the system will match the users on the remote server whose group name value is the same as you defined,” Fortinet explains. CVE-2026-26035 was patched in FortiWeb versions 8.0.3, 7.6.7, 7.4.12, and 7.2.13. As a workaround, the company recommends disabling the wildcard setting. The FortiManager vulnerability, tracked as CVE-2026-70468, is an authentication bypass issue that allows remote attackers to impersonate any FortiGate device managed by FortiManager. It requires a specific CLI option to be set and for the attacker to have a valid certificate. Fortinet also patched a high-severity buffer overflow bug (CVE-2026-70465) in FortiClient for Windows that could allow unauthenticated attackers who can modify or craft DNS responses to execute arbitrary code. On Wednesday, the company also resolved medium- and low-severity security defects in FortiWeb WAF, FortiOS, and FortiSIEM, and published an advisory detailing the impact of CVE-2026-49975, the HTTP/2 Bomb attack affecting Apache HTTP Server. Fortinet makes no mention of any of these vulnerabilities being exploited in the wild. Additional information can be found on the company’s PSIRT advisories page. Related: Critical VMware vCenter Vulnerability in Attackers’ Crosshairs Related: Nightmare Eclipse Drops Windows Zero-Day Exploit ‘ShieldBreak’ Related: SharePoint Vulnerability Exploited Shortly After PoC Release Related: Adobe Urges Immediate Patching of Critical ColdFusion, Campaign Classic Flaws WRITTEN BY Ionut Arghire Ionut Arghire is an international correspondent for SecurityWeek. More from Ionut Arghire Ceva Logistics Operations Disrupted by Cyberattack Over 2,500 Organizations Impacted by LiteLLM Supply Chain Attack Fresh Windows Zero-Day Exploited in North Korean Cyberattacks Ivanti EPM Update Patches Remotely Exploitable Flaws SonicWall Patches Critical Vulnerabilities in Discontinued GMS Platform August 2026 Patch Tuesday: Microsoft Fixes 421 CVEs, One Exploited Zero-Day Adobe Urges Immediate Patching of Critical ColdFusion, Campaign Classic Flaws Zoom Patches Zero-Click Code Execution Vulnerability Latest News Venture Firm Team8 Secures Additional $365 Million White House Mobilizes Security Firms for Operations Against Foreign Cybercrime Gangs Critical VMware vCenter Vulnerability in Attackers’ Crosshairs Nightmare Eclipse Drops Windows Zero-Day Exploit ‘ShieldBreak’ SharePoint Vulnerability Exploited Shortly After PoC Release Mindgard Raises $30 Million to Protect AI Systems Stealthy ‘City-Forum’ Attacks Target Salesforce and ServiceNow With Custom Toolset WhatsApp Unveils New Scam Alert Feature Trending Webinar: Rethinking Cyber Defense For AI-Speed Attacks August 18, 2026 Join this live webinar as we explore if detection-first security operations can keep pace with AI, or if it’s time to rethink prevention as the strongest default. Register Virtual Event: CodeSecCon 2026 August 19, 2026 CodeSecCon bridges the gap between dev and security. Discover best practices for secure coding, innovative risk-reduction tools, and safe AI integration to cultivate a true DevSecOps culture. Safely secure your apps! Register People on the Move Erika Dean has been appointed Chief Information Security Officer at Tricentis. C1 has named Jeff St. Clair Chief Revenue Officer. John Opala has joined Ralph Lauren as Chief Information Security Officer. More People On The Move Expert Insights The AI Governance Gap Is A Leadership Problem: Waiting Won’t Close It Organizations are rushing to implement AI without fully grasping where its legal protections begin and end. (Steve Durbin) Rethinking AI Security: Why CASB And DLP Need An Interaction-Aware Layer Build your strategy around answering these questions to ensure employees use AI productively while keeping sensitive data, IP, and agent behavior within the boundaries set for safe AI use. (Etay Maor) Timeless Compliance: Why Better Questions Beat Bigger Frameworks The best compliance programs aren't the biggest ones. They're the ones built on a short list of questions that can actually be answered, and that still hold true when the models change. (Matt Honea) Is Patching Dead? Vulnerability Management In The Post-Mythos Era You cannot out-patch a machine that writes a working exploit from a vulnerability description in twenty hours. Stop trying to optimize a game you cannot win. (Danelle Au) When Identity Verification Fails: Lessons From A Real-World SIM Swap And Near Account Takeover Identity confidence changes throughout every interaction and should be reassessed continuously as new risk signals emerge. (Torsten George) Flipboard Reddit Whatsapp Email