CVE-2026-121530: Fortinet Broken Access Control in Two-Factor-Authentication
This Fortinet advisory covers CVE-2026-121530 in FortiOS.
Key facts
- Vendor rating
- Medium, CVSS 5.9
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C· base score 5.9, scored by fortinetAttack vector: network. Attack complexity: high. Privileges required: high. User interaction: none. Scope: unchanged. Confidentiality impact: high. Integrity impact: high. Availability impact: high.- Weakness
- CWE-287 Improper access control
- CISA KEV
- Not listed (catalogue checked )
- Affected
- FortiOS: 7.6.0 through 7.6.6 (vendor-listed versions)
- Advisory id
- FG-IR-26-195
- Source published
- Source revised
- Listed by VulniPulse
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
Description
CVSSv3 Score:
5.9
An Improper Authentication vulnerability [CWE-287] in the FortiOS Remote Radius Type Admin Two-Factor (TFA) Authentication may allow a remote authenticated attacker with at least read-only permission to log in to the FortiOS GUI with an invalid token after entering a valid username and password, in scenarios where the RADIUS server returns an additional "Access-Challenge" response following an invalid TFA token.
Revised on 2026-11-10 00:00:00
Text from the source record.
- FortiOS: 7.6.0 through 7.6.6 (vendor-listed versions)
Official advisory · high-confidence parse· fetched ·verify at source
End-of-life dates for Fortinet FortiOS
CVE-2026-121530 in other vendors' advisories
- Fortinet: CVE-2026-121530, medium severity
More Fortinet advisories
CVE-2026-121530Nov 10, 2026FortiOS authentication bypassCVE-2026-126255Nov 10, 2026Improper neutralization of special elements in output used by a downstream componentCVE-2026-126253Nov 10, 2026Authentication bypass by primary weaknessCVE-2026-106174Oct 13, 2026GUI Denial of ServiceCVE-2026-106175Oct 13, 2026Double free in signal handlerCVE-2025-53844May 12, 2026Out-of-bounds access in CAPWAP daemon
Get an email when Fortinet FortiGate publishes the next one.
See Fortinet FortiGate's last 90 days of advisories first. Then choose one product with live alerts free for life, or a free month of real-time alerts on everything with the severity, the fixed version and the vendor's link (card needed, then US$15/month; we email you before the first charge).
iPhone and Android apps · New on the App Store
Monitor future Fortinet CVEs from your phone.
Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 34 official vendor sources and 160+ reviewed platform categories.
