Critical cybersecurity update: Fortinet Patches Authentication Flaws in FortiWeb and FortiManager. NetworkFix reviewed the available source material to summarize the security issue, its potential impact and the defensive actions administrators should prioritize.
What Happened
The vulnerabilities could allow attackers to log in with random usernames and passwords or impersonate any FortiGate appliance. The post Fortinet Patches Authentication Flaws in FortiWeb and FortiManager appeared first on SecurityWeek . Fortinet Patches Authentication Flaws in FortiWeb and FortiManager – SecurityWeek 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. 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.
Technical Details
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. 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 Ionut Arghire is an international correspondent for SecurityWeek. Mindgard Raises $30 Million to Protect AI Systems Over 2,500 Organizations Impacted by LiteLLM Supply Chain Attack Fresh Windows Zero-Day Exploited in North Korean Cyberattacks 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 Cybersecurity M&A Roundup: 21 Deals Announced in July 2026 White House Mobilizes Security Firms for Operations Against Foreign Cybercrime Gangs 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. CodeSecCon bridges the gap between dev and security.
Security Impact
Organizations using the affected technology should treat the report according to its critical severity classification. Discover best practices for secure coding, innovative risk-reduction tools, and safe AI integration to cultivate a true DevSecOps culture. Erika Dean has been appointed Chief Information Security Officer at Tricentis. John Opala has joined Ralph Lauren as Chief Information Security Officer. 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.
Recommended Actions
- Identify whether the affected product, service or software is present in the environment.
- Review the original vendor or research advisory and verify affected versions before making configuration changes.
- Apply vendor-provided security updates or mitigations as soon as operationally practical.
- Review relevant security logs and monitoring alerts for signs of suspicious activity associated with the reported issue.
- Use the CVE identifiers, where available, to validate exposure through vulnerability-management and asset-inventory tools.
Security Details
- Severity: Critical
- Original source: SecurityWeek
Why This Matters
Cybersecurity teams should use reports like this as an input to risk-based vulnerability and threat management rather than relying on headline severity alone. Exposure depends on whether the affected technology is deployed, reachable by an attacker and protected by compensating controls. Confirming asset ownership, affected versions and available vendor fixes helps teams prioritize remediation while avoiding unnecessary emergency changes.
Original Report
NetworkFix recommends reviewing the complete original report from SecurityWeek for the authoritative technical context, affected versions, indicators and vendor-specific remediation details: Read the original report.
