Security readout for executives and security teams
Plain-English summary
Affected FortiWeb appliances may accept a forged SAML response and let an unauthenticated attacker bypass FortiCloud SSO. Successful abuse could expose protected management capabilities and materially affect confidentiality, integrity, and availability. The supplied evidence does not specify the access level obtained after bypass.
Executive priority
Treat as an urgent remediation item where affected FortiWeb systems use FortiCloud SSO. The authentication bypass requires no credentials or user interaction and carries critical potential impact. Systems outside the stated versions should still be confirmed through inventory rather than assumed safe.
Technical view
CVE-2025-59719 is a CWE-347 signature-verification flaw affecting FortiWeb 8.0.0, 7.6.0–7.6.4, and 7.4.0–7.4.9. A crafted SAML response can bypass FortiCloud SSO authentication. CVSS 3.1 rates it 9.1, with network access, low complexity, no privileges, and no user interaction required.
Likely exposure
Exposure is most likely where an affected FortiWeb version uses the FortiCloud SSO login path. The supplied record identifies no other affected versions or products. Actual reachability, enabled authentication configuration, and resulting privileges must be verified locally.
Exploitation context
The CVSS temporal metric reports functional exploit maturity. However, the supplied record marks KEV as false and provides no evidence establishing active exploitation. No indicators of compromise or detailed exploitation telemetry are included.
Researcher notes
The core issue is improper cryptographic signature verification in SAML processing. The supplied evidence does not describe the exact validation failure, post-authentication privilege mapping, indicators, or fixed versions. Testing should remain defensive and authorized, focusing on configuration, version validation, logs, and vendor-confirmed remediation.
Mitigation direction
- Consult Fortinet advisory FG-IR-25-647 for supported remediation and fixed-release information.
- Prioritize vendor-supported remediation for affected systems using FortiCloud SSO.
- If remediation is delayed, obtain vendor-approved interim controls; none are established in the supplied evidence.
Validation and detection
- Inventory FortiWeb versions and identify systems running 8.0.0, 7.6.0–7.6.4, or 7.4.0–7.4.9.
- Confirm whether each affected system uses the FortiCloud SSO login path.
- Review authentication and administrative logs for unexpected SSO logins or configuration changes.
- After remediation, verify the installed version against Fortinet guidance and retest legitimate SSO authentication.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-347: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2025-59719 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C3.95.9fortinetVulnerability scoring details
Base CVSS 3.1 score
9.1CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://fortiguard.fortinet.com/psirt/FG-IR-25-647CVE reference, fortinet
- https://cert-portal.siemens.com/productcert/html/ssa-864900.htmlCVE reference, siemens-SADP
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Verification of Cryptographic Signature
Improper Verification of Cryptographic Signature represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.