CVE-2025-59718
Actively exploited. CVE-2025-59718 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-12-16) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Public exploit code is available. Proof-of-concept or working exploit code for CVE-2025-59718 is indexed in GitHub PoC. Expect opportunistic scanning and exploitation attempts — prioritize remediation.
Fortinet FortiOS, FortiSwitchMaster, FortiProxy, and FortiWeb contain an improper verification of cryptographic signature vulnerability that may allow an unauthenticated attacker to bypass the FortiCloud SSO login authentication via a crafted SAML message. Please be aware that CVE-2025-59719 pertains to the same problem and is mentioned in the same vendor advisory. Ensure to apply all patches mentioned in the advisory.
CSIRTS triage
- What
- This vulnerability may allow an unauthenticated attacker to bypass FortiCloud SSO login authentication.
- Who is affected
- Users of Fortinet products listed in the advisory.
- Urgency
- Remediation is urgent due to the critical nature of the vulnerability and confirmed exploitation.
- Action
- Apply all patches mentioned in the Fortinet advisory.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 99.2% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2025-59718 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- GitHub PoCPublic proof-of-concept repositories on GitHub reference this CVE.look it up ↗
Advisory coverage (2)
- criticalexploitedAL26-014 – FortiBleed leak of thousands of compromised credentials impacting Fortinet devicescccs · 2026-06-18
- criticalexploitedCVE-2025-59718: Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerabilitycisa-kev · 2025-12-16
External references
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