How severe is CVE-2026-24858?

CVE-2026-24858 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-24858 being actively exploited?

Yes. CVE-2026-24858 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-01-27, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2026-24858?

CVE-2026-24858 primarily affects Fortinet Fortianalyzer. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-24858?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2026-24858 have an EU (EUVD) identifier?

Yes. CVE-2026-24858 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4712. It is also flagged as exploited in the EUVD (since 2026-01-27).

When was CVE-2026-24858 published?

CVE-2026-24858 was published on 2026-01-27 and last updated on 2026-06-17.

CVE-2026-24858

CVE-2026-24858 is a critical-severity vulnerability in Fortinet Fortianalyzer with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2026-01-27). The underlying weakness is classified as CWE-288.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 86% (100th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2026-01-27)
EU (EUVD) id: EUVD-2026-4712
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2026-01-27)
Weakness: CWE-288
Affected product: Fortinet Fortianalyzer
Published: 2026-01-27
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-24858?: 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.
How severe is CVE-2026-24858?: CVE-2026-24858 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-24858 being actively exploited?: Yes. CVE-2026-24858 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-01-27, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2026-24858?: CVE-2026-24858 primarily affects Fortinet Fortianalyzer. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-24858?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2026-24858 have an EU (EUVD) identifier?: Yes. CVE-2026-24858 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4712. It is also flagged as exploited in the EUVD (since 2026-01-27).
When was CVE-2026-24858 published?: CVE-2026-24858 was published on 2026-01-27 and last updated on 2026-06-17.

References

Affected products (7)

cpe:2.3:a:fortinet:fortianalyzer:*:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortimanager:*:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortinac-f:*:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortiweb:*:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:ruggedcom_ape1808_firmware:-:*:*:*:*:*:*:*

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