KEV Intelligence

Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2026-24858

FortiWeb Authentication Bypass

Fortinet / FortiWeb · affected before *

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Severity
CVSS 9.4 · Critical
Confidence
Confirmed
Exploit status
Exploited in the wild
EPSS
85.8%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-24858 is an unauthenticated vulnerability affecting Fortinet FortiWeb and 5 other products. An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] vulnerability in Fortinet...

Is it exploited?

Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.

Who is affected?

Fortinet / FortiWeb affected before *.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

FortiWeb Authentication Bypass

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.

Vendor Product Affected Status
Siemens RUGGEDCOM APE1808 Before * Affected
Fortinet FortiWeb Through 8.0.3 Affected
Fortinet FortiWeb Through 7.6.6 Affected
Fortinet FortiWeb Through 7.4.11 Affected
Fortinet FortiNAC-F Through 7.6.5 Affected
Fortinet FortiOS Through 7.6.5 Affected
Fortinet FortiOS Through 7.4.10 Affected
Fortinet FortiOS Through 7.2.12 Affected
Fortinet FortiOS Through 7.0.18 Affected
Fortinet FortiAnalyzer Through 7.6.5 Affected
Fortinet FortiAnalyzer Through 7.4.9 Affected
Fortinet FortiAnalyzer Through 7.2.11 Affected
Fortinet FortiAnalyzer Through 7.0.15 Affected
Fortinet FortiProxy Through 7.6.4 Affected
Fortinet FortiProxy Through 7.4.12 Affected
Fortinet FortiProxy Through 7.2.15 Affected
Fortinet FortiProxy Through 7.0.22 Affected
Fortinet FortiManager Through 7.6.5 Affected
Fortinet FortiManager Through 7.4.9 Affected
Fortinet FortiManager Through 7.2.11 Affected
Fortinet FortiManager Through 7.0.15 Affected
Published
27 Jan 2026
Exploitation Reported
01 Jun 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

cisa ios edge

CVE References

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CVE

Recorded 01 Jun 2026

Independent exploitation attestation added to the KEV Intelligence record.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.

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Source Added
CVE First 2026-06-01 10:49 UTC
CISA 2026-06-02 14:03 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
0
User-Agents
0

Raw values available in Pro and Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

9.4 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C

EPSS

85.8%

Weaknesses

Authentication Bypass Using an Alternate Path or Channel CWE-288

Timeline

From disclosure to observed exploitation

  1. Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  2. Added to KEV Intelligence KEV Feed

    High-confidence, third-party attested exploitation

  3. CVE published

    Vulnerability disclosed publicly

  4. CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-24858

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2026-24858",
  "confidence": "Confirmed",
  "cvss_score": 9.4,
  "cvss_estimated": false,
  "epss_score": 0.85844,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

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