CVE-2026-24858
Confirmed PUBLISHEDAn Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] vulnerability in Fortinet FortiAnalyzer 7.6.0 through 7.6.5,...
1 day faster than CISA KEV
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
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.
- CVE Published
- Jan 27, 2026
- Exploitation Reported
- Jun 01, 2026
- CVSS
- 9.4 Critical
- EPSS
- 85.8%
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| Siemens |
RUGGEDCOM APE1808
|
0 to < * |
Affected |
| Fortinet |
FortiWeb
|
8.0.0 to <= 8.0.3 |
Affected |
| Fortinet |
FortiWeb
|
7.6.0 to <= 7.6.6 |
Affected |
| Fortinet |
FortiWeb
|
7.4.0 to <= 7.4.11 |
Affected |
| Fortinet |
FortiNAC-F
|
7.6.3 to <= 7.6.5 |
Affected |
| Fortinet |
FortiOS
|
7.6.0 to <= 7.6.5 |
Affected |
| Fortinet |
FortiOS
|
7.4.0 to <= 7.4.10 |
Affected |
| Fortinet |
FortiOS
|
7.2.0 to <= 7.2.12 |
Affected |
| Fortinet |
FortiOS
|
7.0.0 to <= 7.0.18 |
Affected |
| Fortinet |
FortiAnalyzer
|
7.6.0 to <= 7.6.5 |
Affected |
| Fortinet |
FortiAnalyzer
|
7.4.0 to <= 7.4.9 |
Affected |
| Fortinet |
FortiAnalyzer
|
7.2.0 to <= 7.2.11 |
Affected |
| Fortinet |
FortiAnalyzer
|
7.0.0 to <= 7.0.15 |
Affected |
| Fortinet |
FortiProxy
|
7.6.0 to <= 7.6.4 |
Affected |
| Fortinet |
FortiProxy
|
7.4.0 to <= 7.4.12 |
Affected |
| Fortinet |
FortiProxy
|
7.2.0 to <= 7.2.15 |
Affected |
| Fortinet |
FortiProxy
|
7.0.0 to <= 7.0.22 |
Affected |
| Fortinet |
FortiManager
|
7.6.0 to <= 7.6.5 |
Affected |
| Fortinet |
FortiManager
|
7.4.0 to <= 7.4.9 |
Affected |
| Fortinet |
FortiManager
|
7.2.0 to <= 7.2.11 |
Affected |
| Fortinet |
FortiManager
|
7.0.0 to <= 7.0.15 |
Affected |
CVE References
- https://fortiguard.fortinet.com/psirt/FG-IR-26-060 fortiguard.fortinet.com · CVE Record https://fortiguard.fortinet.com/psirt/FG-IR-26-060
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CVE First | 2026-06-01 10:49 UTC |
| CISA | 2026-06-02 14:03 UTC |
No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
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
Exploitation Status
Exploited in the wild
Recorded 2026-06-01 10:49:56 UTC · CVE
Proof of concept available
Recorded 2026-01-30 04:27:24 UTC · GitHub
Weaknesses (CWE)
-
Authentication Bypass Using an Alternate Path or Channel
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
github · Created 2026-01-30 04:27:24 UTC · 0 stars
A Proof-of-Concept demonstrating the application of 3D Navier-Stokes CTT formulations to packet flow optimization and defensive bypass.
github · Created 2026-01-30 03:29:04 UTC · 7 stars
CVE-2026-24858 FortiCloud Single Sign On (SSO) a factory default enabled feature once you register any FortiGate/FortiManager/FortiAnalyzer contains a critical authentication bypass flaw.
github · Created 2026-01-28 14:34:50 UTC · 0 stars
아직 제로데이인거 같아, 공개되거나 천천히 분석할 예정....
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
14:03 UTC about 2 months ago14:03 UTC · about 2 months ago
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
10:49 UTC about 2 months ago10:49 UTC · about 2 months ago
Added to KEVIntel KEV Feed
High-confidence, third-party attested exploitation
-
14:34 UTC 6 months ago14:34 UTC · 6 months ago
Public PoC available
Public proof-of-concept code published
-
19:18 UTC 6 months ago19:18 UTC · 6 months ago
CVE published
Vulnerability disclosed publicly
-
15:11 UTC 6 months ago15:11 UTC · 6 months ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2026-24858
{
"cve_id": "CVE-2026-24858",
"title": "An Authentication Bypass Using an Alternate Path or Channel vulnerability [CW...",
"affected_vendor": "Fortinet",
"affected_product": "FortiWeb, FortiNAC-F, FortiOS, FortiAnalyzer, FortiProxy, FortiManager",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 9.4,
"epss_score": 0.85844,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}