CVE-2026-24858
An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] vulnerability in Fortinet FortiAnalyzer 7.6.0 through 7.6.5, FortiAnalyzer 7.4.0 through 7.4.9, FortiAnalyzer 7.2.0 through 7.2.11, FortiAnalyzer 7.0.0 through 7.0.15, FortiManager 7.6.0 through 7.6.5, FortiManager 7.4.0 through 7.4.9, FortiManager 7.2.0 through 7.2.11, FortiManager 7.0.0 through 7.0.15, FortiNAC-F 7.6.3 through 7.6.5, FortiOS 7.6.0 through 7.6.5, FortiOS 7.4.0 through 7.4.10, FortiOS 7.2.0 through 7.2.12, FortiOS 7.0.0 through 7.0.18, FortiProxy 7.6.0 through 7.6.4, FortiProxy 7.4.0 through 7.4.12, FortiProxy 7.2.0 through 7.2.15, FortiProxy 7.0.0 through 7.0.22, FortiWeb 8.0.0 through 8.0.3, FortiWeb 7.6.0 through 7.6.6, FortiWeb 7.4.0 through 7.4.11 may allow an attacker with a FortiCloud account and a registered device to log into other devices registered to other accounts, if FortiCloud SSO authentication is enabled on those devices.
- Affected
- Fortinet · FortiWeb · FortiNAC-F · FortiOS · FortiAnalyzer · FortiProxy · FortiManager
- CVSS v3.1 FORTINET
- 9.8 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS
- 85.80% chance of exploitation in the next 30 days, 100th percentile
- CISA KEV
- added 2026-01-27
- Published
- 2026-01-27
- Updated
- 2026-06-09
Proof-of-concept exploits (4)
- m0d0ri205/CVE-2026-248580★ · 2026-01-29
- absholi7ly/CVE-2026-24858-FortiCloud-SSO-Authentication-Bypass9★ · 2026-01-30
- gagaltotal/cve-2026-248581★ · 2026-02-10
- SimoesCTT/-CTT-NSP-Convergent-Time-Theory---Network-Stack-Projection-CVE-2026-24858-0★ · 2026-01-30
Security advisories
- https://fortiguard.fortinet.com/psirt/FG-IR-26-060
- https://www.fortinet.com/blog/psirt-blogs/analysis-of-sso-abuse-on-fortios
- https://cert-portal.siemens.com/productcert/html/ssa-975644.html