Coverage › CVE-2026-24858
CVE-2026-24858 Unmapped
Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerability
- Vendor / product
- Fortinet — Multiple Products
- Description (CISA)
- 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.
- Added to KEV
- 2026-01-27 — after the latest CTID mapping snapshot (2025-07-28)
- Due date
- 2026-01-30
- 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.
- Known ransomware use
- Unknown
- CWE
- CWE-288
- CISA notes
- Please adhere to Fortinet's guidelines to assess exposure and mitigate risks. Check for signs of potential compromise on all internet accessible Fortinet products affected by this vulnerability. Apply any final mitigations provided by the vendor as soon as they become available. For more information please see: https://fortiguard.fortinet.com/psirt/FG-IR-26-060
https://www.fortinet.com/blog/psirt-blogs/analysis-of-sso-abuse-on-fortios
https://nvd.nist.gov/vuln/detail/CVE-2026-24858 - Elsewhere
- cve.org · NVD · CISA KEV · JSON
ATT&CK techniques
No public source states how this vulnerability is exploited in ATT&CK terms.
The only authoritative CVE → ATT&CK mapping in the open — CTID's Mappings Explorer, pinned to a KEV snapshot of 2025-07-28 and ATT&CK 16.1 — does not include CVE-2026-24858. This entry was added to KEV on 2026-01-27, after that snapshot; of the 283 entries added since, 0 have a mapping. CISA's catalogue carries no technique field. kevmap does not infer techniques from the CWE (CWE-288) — here is why — and does not guess.
This page will change state automatically if a mapping is published. What is shown above is everything CISA publishes about the entry.