FortiWeb FortiCloud SSO Authentication Bypass via Crafted SAML Response
CVE-2025-59719 is an improper verification of cryptographic signature vulnerability in Fortinet FortiWeb affecting 8.0.0, 7.6.0 through 7.6.4, and 7.4.0 through 7.4.9. The flaw is in FortiCloud SSO login handling, where a crafted SAML response message can be accepted despite improper signature verification. As a result, an unauthenticated attacker can bypass FortiCloud SSO authentication and obtain unauthorized access to the administrative interface when the FortiCloud SSO login feature is enabled on the device.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
164 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Fortinet authentication bypass vulnerability associated with FortiCloud SSO login, referenced as requiring patching.
A FortiGate FortiCloud SSO-related vulnerability that can grant unauthorized administrative access to vulnerable devices, enabling attackers to download configuration files, alter firewall settings, access VPN-related credentials, and facilitate broader compromise of the environment.
A FortiCloud SSO vulnerability affecting FortiGate devices that can be chained to grant unauthorized administrative access and lead to full device compromise.
A known vulnerability in FortiGate Next-Generation Firewall appliances leveraged by attackers to gain access and extract configuration files.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.