Exploited vulnerabilities / CVE-2026-24858
Confirmed exploited · authentication bypass · Fortinet Multiple ProductsCVE-2026-24858
Fortinet Multiple Products authentication bypass, confirmed exploited in the wild.
Fortinet FortiAnalyzer, FortiManager, FortiOS, and FortiProxy contain an authentication bypass using an alternate path or channel that could 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.
| CISA's name for it | Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerability |
|---|---|
| Vendor and product | Fortinet · Multiple Products |
| Type | authentication bypass · CWE-288 |
| Exploited | Confirmed by CISA listed 27 January 2026 |
| Likelihood | one of the most likely to be exploited of every vulnerability tracked |
| Deadline | 30 January 2026 · already passed |
| Used in ransomware | Not reported |
| Advisories | fortiguard.fortinet.com ↗ · www.fortinet.com ↗ · nvd.nist.gov ↗ |
Three steps, in this order
Apply the vendor fix and restart the affected service.
Put the login or management interface behind a VPN or allow-list; a bypass makes passwords irrelevant.
Rotate credentials and session keys the product holds, and review accounts and configuration changes since the listing date.
| CISA's required action | Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. |
|---|
Know before someone else finds it
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CVE-2026-24858 in short
Is CVE-2026-24858 being exploited?
Yes. CISA added CVE-2026-24858 to its Known Exploited Vulnerabilities catalogue on 27 January 2026, which it does only on evidence of exploitation in the wild.
What is the CISA deadline for CVE-2026-24858?
US federal agencies must remediate it by 30 January 2026. Everyone else should treat that date as the latest safe point to patch an internet-facing system.
How likely is CVE-2026-24858 to be exploited in the next 30 days?
FIRST's Exploit Prediction Scoring System gives it 87%, the 99th percentile of every CVE it scores.
How do I fix CVE-2026-24858?
Apply the vendor fix and restart the affected service. Put the login or management interface behind a VPN or allow-list; a bypass makes passwords irrelevant. Rotate credentials and session keys the product holds, and review accounts and configuration changes since the listing date.
Other Fortinet vulnerabilities being exploited
| CVE | Product | Type | Listed |
|---|---|---|---|
| CVE-2025-61624 | Multiple Products | path traversal | 16 October 2026 |
| CVE-2026-104286 | FortiMail | path traversal | 1 October 2026 |
| CVE-2025-25249 | Multiple Products | memory corruption | 9 September 2026 |
| CVE-2025-68686 | FortiOS | exploited vulnerability | 27 July 2026 |
| CVE-2026-25089 | FortiSandbox | command injection | 16 July 2026 |
| CVE-2026-39808 | FortiSandbox | command injection | 16 July 2026 |
Sources: CISA Known Exploited Vulnerabilities catalogue (released 10 November 2026) and FIRST EPSS. Page compiled automatically by SAK T.L.M, the threat-intelligence tool of SAK T.E.C, on 13 November 2026.