CVE-2026-24858

CRITICAL KEV

Fortinet FortiAnalyzer 7.0.0-7.0.15, 7.2.0-7.2.11, 7.4.0-7.4.9, 7.6.0-7.6.5 - Authentication Bypass via FortiCloud SSO

Title source: llm
STIX 2.1

Exploitation Summary

CVE-2026-24858 is actively exploited and listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added January 27, 2026. EIP tracks 6 public exploits from researchers including XiaomingX, absholi7ly, gagaltotal.

AI-analyzed exploit summary This repository contains a functional exploit PoC for CVE-2026-24858, targeting FortiCloud SSO identity management via a temporal vulnerability in the SAML state machine. The exploit uses fluid dynamics principles to synchronize a low-privilege account with an administrator session.

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, 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.

Exploits (6)

github WORKING POC 10 stars
by XiaomingX · pythonpoc
https://github.com/XiaomingX/data-cve-poc-py-v1/tree/main/2026/CVE-2026-24858

This repository contains a functional exploit PoC for CVE-2026-24858, targeting FortiCloud SSO identity management via a temporal vulnerability in the SAML state machine. The exploit uses fluid dynamics principles to synchronize a low-privilege account with an administrator session.

Classification
Working Poc 95%
Attack Type
Auth Bypass
Complexity
Complex
Reliability
Theoretical
Target: FortiCloud SSO
Auth required
Prerequisites: valid FortiCloud account · registered dummy device · attacker token
devstral-2 · analyzed Feb 27, 2026 Full analysis →
nomisec WORKING POC 2 stars
by absholi7ly · poc
https://github.com/absholi7ly/CVE-2026-24858-FortiCloud-SSO-Authentication-Bypass

This PoC demonstrates an authentication bypass vulnerability in FortiCloud SSO, allowing an attacker with a valid FortiCloud account to reuse their SSO token to gain unauthorized access to other customers' FortiGate/FortiManager/FortiAnalyzer appliances. Successful exploitation grants full admin GUI access and a root shell.

Classification
Working Poc 100%
Attack Type
Auth Bypass
Complexity
Trivial
Reliability
Reliable
Target: FortiCloud SSO (FortiOS 7.0.0–7.0.18, 7.2.0–7.2.12, 7.4.0–7.4.10, 7.6.0–7.6.5; FortiManager 7.0.0–7.0.10, 7.2.0–7.2.5, 7.4.0–7.4.9; FortiAnalyzer same ranges)
Auth required
Prerequisites: A valid FortiCloud account (free or paid) · Network access to the target appliance
devstral-2 · analyzed Feb 16, 2026 Full analysis →
nomisec WORKING POC
by gagaltotal · poc
https://github.com/gagaltotal/cve-2026-24858

This repository contains a Python-based PoC for CVE-2026-24858, an administrative FortiCloud SSO authentication bypass vulnerability. It includes both a scanner to detect Fortinet web management indicators and an optional exploit sender that requires explicit enabling via a flag.

Classification
Working Poc 90%
Attack Type
Auth Bypass
Complexity
Moderate
Reliability
Reliable
Target: Fortinet FortiCloud SSO
No auth needed
Prerequisites: Network access to the target FortiCloud SSO interface · Python environment with required dependencies
devstral-2 · analyzed Feb 16, 2026 Full analysis →
nomisec WORKING POC
by SimoesCTT · poc
https://github.com/SimoesCTT/SCTT-2026-33-0004-FortiCloud-SSO-Identity-Singularity

This PoC exploits a temporal vulnerability in FortiCloud's SAML state machine (CVE-2026-24858) by synchronizing a low-privilege account with an admin session through 33-layered resonance attacks, achieving privilege escalation via identity collision.

Classification
Working Poc 90%
Attack Type
Auth Bypass
Complexity
Complex
Reliability
Theoretical
Target: FortiCloud SSO (post-January 2026 patch)
Auth required
Prerequisites: Valid FortiCloud account · Registered dummy device · Target URL and attacker token
devstral-2 · analyzed Feb 16, 2026 Full analysis →
nomisec WORKING POC
by SimoesCTT · poc
https://github.com/SimoesCTT/-CTT-NSP-Convergent-Time-Theory---Network-Stack-Projection-CVE-2026-24858-

This PoC implements a novel network stack projection attack using fluid dynamics principles (CTT-Navier-Stokes mapping) to decompose and deliver payloads across temporal layers. It employs energy cascade techniques and prime resonance timing to evade detection.

Classification
Working Poc 85%
Attack Type
Other
Complexity
Complex
Reliability
Theoretical
Target: Unknown (CTT-NSP Convergent Time Theory - Network Stack Projection)
No auth needed
Prerequisites: Network access to target · Python environment with required libraries
devstral-2 · analyzed Feb 16, 2026 Full analysis →
nomisec WRITEUP
by m0d0ri205 · poc
https://github.com/m0d0ri205/CVE-2026-24858

This is a detailed writeup analyzing CVE-2026-24858, a critical authentication bypass vulnerability in Fortinet FortiCloud SSO. The document provides technical details, affected versions, CVSS scoring, and real-world attack scenarios.

Classification
Writeup 100%
Attack Type
Auth Bypass
Complexity
Moderate
Reliability
Reliable
Target: Fortinet FortiOS, FortiProxy, FortiPAM, FortiSwitchManager
No auth needed
Prerequisites: FortiCloud SSO enabled · Management interface exposed to the internet · Vulnerable firmware version
devstral-2 · analyzed Feb 16, 2026 Full analysis →

Scores

CVSS v3 9.8
EPSS 0.0395
EPSS Percentile 88.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation active
Automatable yes
Technical Impact total

Details

CISA KEV 2026-01-27
VulnCheck KEV 2026-01-27
ENISA EUVD EUVD-2026-4712
CWE
CWE-288
Status published
Products (27)
fortinet/fortianalyzer 7.0.0 - 7.0.15
Fortinet/FortiAnalyzer 7.0.0 - 7.0.15
Fortinet/FortiAnalyzer 7.2.0 - 7.2.11
Fortinet/FortiAnalyzer 7.4.0 - 7.4.9
Fortinet/FortiAnalyzer 7.6.0 - 7.6.5
fortinet/fortimanager 7.0.0 - 7.0.15
Fortinet/FortiManager 7.0.0 - 7.0.15
Fortinet/FortiManager 7.2.0 - 7.2.11
Fortinet/FortiManager 7.4.0 - 7.4.9
Fortinet/FortiManager 7.6.0 - 7.6.5
... and 17 more
Published Jan 27, 2026
KEV Added Jan 27, 2026
Tracked Since Feb 18, 2026