CVSS 3.1
9.3 criticalCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:HCVE-2026-126253 fortinet fortios
Critical (9.3) in fortinet fortios. EPSS 0.4% estimated probability of exploitation activity in the next 30 days.
A authentication bypass by primary weakness vulnerability in Fortinet FortiOS 8.0.0 through 8.0.1, FortiOS 7.6.0 through 7.6.7, FortiOS 7.4.0 through 7.4.12, FortiOS 7.2.0 through 7.2.13 may allow an unauthenticated attacker to broadcast LSA via specially crafted request
Severity
- EPSS
- 0.4% estimated probability of exploitation activity in the next 30 days; 32nd percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
- CISA's assessment (SSVC)
- Exploitation: none · Automatable: yes · Technical impact: partial, assessed 2026-11-12. From CISA's Vulnrichment in the CVE List: whether it is exploited, whether exploiting it can be automated, and how much control it gives.
- CWE
- CWE-305 Authentication Bypass by Primary Weakness
- OWASP Top 10
- A07:2025 Authentication Failures
- Published
- Modified
- Assigned by
- fortinet (CNA)
- NVD analysis
- Awaiting analysis
- Record from
- the NVD, synced
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Explain CVE-2026-126253 for an engineer deciding whether to act. Use https://cve.bz/api/public/cves/CVE-2026-126253?via=ask-ai-copy and https://cve.bz/cve/CVE-2026-126253?via=ask-ai-copy as the source of truth: what is affected and which versions fix it, whether it is in CISA KEV, public exploits, and its EPSS (an internet-wide 30-day estimate of exploitation activity, not a forecast for my systems). If they give no fixed versions, use the CVE record https://cveawg.mitre.org/api/cve/CVE-2026-126253 or the vendor advisory, not third-party mirrors. Tell me how to check whether I am affected and how to verify a fix. Cite the sources and say where they are uncertain.Opens a third-party assistant; its answer is its own, not cve.bz's. The prompt holds only this CVE's id and public links.
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Affected
Versions
From the CNA's record in the CVE List.
| Product | Affected |
|---|---|
| Fortinet FortiOS | from 8.0.0 through 8.0.1 |
| Fortinet FortiOS | from 7.6.0 through 7.6.7 |
| Fortinet FortiOS | from 7.4.0 through 7.4.12 |
| Fortinet FortiOS | from 7.2.0 through 7.2.13 |
| Fortinet FortiOS | from 7.0.1 through 7.0.19 |