Fortinet FortiWeb
An improper verification of cryptographic signature vulnerability in Fortinet FortiWeb 8.0.0, FortiWeb 7.6.0 through 7.6.4, FortiWeb 7.4.0 through 7.4.9 may allow an unauthenticated attacker to bypass the FortiCloud SSO login…
Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.
Exploitation probability EPSS · FIRST
Exploitation signals 3 / 5
- KEV catalog (CISA)no
- Exploited in EUVD (ENISA)27 Jan 2026
- Used by ransomwareno
- EPSS above 10 %29.2%
- No account, over the networkyes
What to do
Fix
Apply the vendor’s fix as soon as it is available.
Meanwhile
Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.
Manufacturers (CRA)
Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained
Description ENISA EUVD
An improper verification of cryptographic signature vulnerability in Fortinet FortiWeb 8.0.0, FortiWeb 7.6.0 through 7.6.4, FortiWeb 7.4.0 through 7.4.9 may allow an unauthenticated attacker to bypass the FortiCloud SSO login authentication via a crafted SAML response message.
Affected products
- 7.6.0 ≤7.6.4
- 7.4.0 ≤7.4.9
- 8.0.0
Open source packages OSV
Affected libraries according to OSV, with fixed versions.
Timeline
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Published
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Exploitation reported (ENISA)
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EPSS peak: 29.2%
References
Other exploited vulnerabilities from the same vendor
- CVE-2025-61624Fortinet Multiple Products Path Traversal Vulnerability3.4 · Rising fast
- CVE-2026-104286Fortinet FortiMail Path Traversal Vulnerability5.9 · Actively exploited
- CVE-2025-25249Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability4.9 · Actively exploited
- CVE-2025-68686Fortinet FortiOS Exposure of Sensitive Information to an Unauthorized Actor Vulnerability5.4 · Actively exploited
- CVE-2026-39808Fortinet FortiSandbox OS Command Injection Vulnerability8.8 · Actively exploited
- CVE-2026-25089Fortinet FortiSandbox OS Command Injection Vulnerability8.3 · Actively exploited