CVE-2026-126253

Unauthenticated Authentication Bypass in Fortinet FortiOS Allowing LSA Broadcast

Published Nov 11, 2026 CVSS 3.1 · 9.3 Critical EPSS < 1% KEV · Not listed

Description

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

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Fortinet

FortiOS

unaffected

Version	Status	Constraints
`8.0.0`	affected	≤ 8.0.1
`7.6.0`	affected	≤ 7.6.7
`7.4.0`	affected	≤ 7.4.12
`7.2.0`	affected	≤ 7.2.13
`7.0.1`	affected	≤ 7.0.19

No data.

Vendor Product Versions

Fortinet

Fortios

Version	Status	Scheme	Platform
`[8.0.0,8.0.1]`	affected	semver	—
`[7.6.0,7.6.7]`	affected	semver	—
`[7.4.0,7.4.12]`	affected	semver	—
`[7.2.0,7.2.13]`	affected	semver	—
`[7.0.1,7.0.19]`	affected	semver	—

Remediation

Vendor Solution

Upgrade to FortiOS version 8.0.2 or above Upgrade to FortiOS version 7.6.8 or above Upgrade to FortiOS version 7.4.13 or above Upgrade to FortiOS version 7.2.14 or above

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact None

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.374% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://fortiguard.fortinet.com/psirt/FG-IR-26-267

History

Nov 12, 2026 5:15 PM Title updated View changes

Type	Values Removed	Values Added
Title		Unauthenticated Authentication Bypass in Fortinet FortiOS Allowing LSA Broadcast

Nov 11, 2026 9:45 PM Description updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		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
First Time appeared		Fortinet Fortinet fortios
Weaknesses		CWE-305
CPEs		cpe:2.3:o:fortinet:fortios:7.0.10:::::::* cpe:2.3:o:fortinet:fortios:7.0.11:::::::* cpe:2.3:o:fortinet:fortios:7.0.12:::::::* cpe:2.3:o:fortinet:fortios:7.0.13:::::::* cpe:2.3:o:fortinet:fortios:7.0.14:::::::* cpe:2.3:o:fortinet:fortios:7.0.15:::::::* cpe:2.3:o:fortinet:fortios:7.0.16:::::::* cpe:2.3:o:fortinet:fortios:7.0.17:::::::* cpe:2.3:o:fortinet:fortios:7.0.18:::::::* cpe:2.3:o:fortinet:fortios:7.0.19:::::::* cpe:2.3:o:fortinet:fortios:7.0.1:::::::* cpe:2.3:o:fortinet:fortios:7.0.2:::::::* cpe:2.3:o:fortinet:fortios:7.0.3:::::::* cpe:2.3:o:fortinet:fortios:7.0.4:::::::* cpe:2.3:o:fortinet:fortios:7.0.5:::::::* cpe:2.3:o:fortinet:fortios:7.0.6:::::::* cpe:2.3:o:fortinet:fortios:7.0.7:::::::* cpe:2.3:o:fortinet:fortios:7.0.8:::::::* cpe:2.3:o:fortinet:fortios:7.0.9:::::::* cpe:2.3:o:fortinet:fortios:7.2.0:::::::* cpe:2.3:o:fortinet:fortios:7.2.10:::::::* cpe:2.3:o:fortinet:fortios:7.2.11:::::::* cpe:2.3:o:fortinet:fortios:7.2.12:::::::* cpe:2.3:o:fortinet:fortios:7.2.13:::::::* cpe:2.3:o:fortinet:fortios:7.2.1:::::::* cpe:2.3:o:fortinet:fortios:7.2.2:::::::* cpe:2.3:o:fortinet:fortios:7.2.3:::::::* cpe:2.3:o:fortinet:fortios:7.2.4:::::::* cpe:2.3:o:fortinet:fortios:7.2.5:::::::* cpe:2.3:o:fortinet:fortios:7.2.6:::::::* cpe:2.3:o:fortinet:fortios:7.2.7:::::::* cpe:2.3:o:fortinet:fortios:7.2.8:::::::* cpe:2.3:o:fortinet:fortios:7.2.9:::::::* cpe:2.3:o:fortinet:fortios:7.4.0:::::::* cpe:2.3:o:fortinet:fortios:7.4.10:::::::* cpe:2.3:o:fortinet:fortios:7.4.11:::::::* cpe:2.3:o:fortinet:fortios:7.4.12:::::::* cpe:2.3:o:fortinet:fortios:7.4.1:::::::* cpe:2.3:o:fortinet:fortios:7.4.2:::::::* cpe:2.3:o:fortinet:fortios:7.4.3:::::::* cpe:2.3:o:fortinet:fortios:7.4.4:::::::* cpe:2.3:o:fortinet:fortios:7.4.5:::::::* cpe:2.3:o:fortinet:fortios:7.4.6:::::::* cpe:2.3:o:fortinet:fortios:7.4.7:::::::* cpe:2.3:o:fortinet:fortios:7.4.8:::::::* cpe:2.3:o:fortinet:fortios:7.4.9:::::::* cpe:2.3:o:fortinet:fortios:7.6.0:::::::* cpe:2.3:o:fortinet:fortios:7.6.1:::::::* cpe:2.3:o:fortinet:fortios:7.6.2:::::::* cpe:2.3:o:fortinet:fortios:7.6.3:::::::* cpe:2.3:o:fortinet:fortios:7.6.4:::::::* cpe:2.3:o:fortinet:fortios:7.6.5:::::::* cpe:2.3:o:fortinet:fortios:7.6.6:::::::* cpe:2.3:o:fortinet:fortios:7.6.7:::::::* cpe:2.3:o:fortinet:fortios:8.0.0:::::::* cpe:2.3:o:fortinet:fortios:8.0.1:::::::*
Vendors & Products		Fortinet Fortinet fortios
References		https://fortiguard.fortinet.com/psirt/FG-IR-26-267
Metrics		cvssV3_1 `{'score': 9.3, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H/E:P/RL:O/RC:C'}`