Detections
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CVE-2026-24858

critical

Description

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, 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.

References

https://thehackernews.com/2026/02/fortinet-patches-critical-sqli-flaw.html

https://securityaffairs.com/187488/security/u-s-cisa-adds-a-flaw-in-ivanti-epmm-to-its-known-exploited-vulnerabilities-catalog.html

https://www.theregister.com/2026/01/28/fortinet_forticloud_vuln/

https://www.securityweek.com/fortinet-patches-exploited-forticloud-sso-authentication-bypass/

https://www.helpnetsecurity.com/2026/01/28/fortinet-forticloud-sso-zero-day-vulnerability-cve-2026-24858/

https://www.databreachtoday.com/fortinet-locks-down-forticloud-sso-amid-zero-day-attacks-a-30612

https://www.darkreading.com/vulnerabilities-threats/fortinet-new-zero-day-malicious-sso-logins

https://www.cisa.gov/news-events/alerts/2026/01/28/fortinet-releases-guidance-address-ongoing-exploitation-authentication-bypass-vulnerability-cve-2026

https://thehackernews.com/2026/01/fortinet-patches-cve-2026-24858-after.html

https://securityaffairs.com/187435/security/u-s-cisa-adds-a-flaw-in-multiple-fortinet-products-to-its-known-exploited-vulnerabilities-catalog-2.html

https://securityaffairs.com/187426/security/fortinet-patches-actively-exploited-fortios-sso-auth-bypass-cve-2026-24858.html

https://cyberscoop.com/ortinet-zero-day-cve-2026-24858-forticloud-sso-auth-bypass/

https://www.fortiguard.com/psirt/FG-IR-26-060

https://www.cisa.gov/news-events/alerts/2026/01/27/cisa-adds-one-known-exploited-vulnerability-catalog

https://www.bleepingcomputer.com/news/security/fortinet-blocks-exploited-forticloud-sso-zero-day-until-patch-is-ready/

https://www.fortinet.com/blog/psirt-blogs/analysis-of-sso-abuse-on-fortios

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-24858

https://fortiguard.fortinet.com/psirt/FG-IR-26-060

Details

Source: Mitre, NVD

Published: 2026-01-27

Updated: 2026-01-29

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 9.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

EPSS

EPSS: 0.03331

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability of Interest