CVE-2026-121530: Fortinet FortiOS authentication bypass
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)
- Source published
- Source revised
- Listed by VulniPulse
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
Description
A improper authentication vulnerability in Fortinet FortiOS 7.6.0 through 7.6.6 may allow a remote authenticated attacker to gain improper access control via an invalid token after entering a valid username and password
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: FG-IR-26-195, medium severity
More Fortinet advisories
CVE-2026-126255Nov 10, 2026Improper neutralization of special elements in output used by a downstream componentCVE-2026-121530Nov 10, 2026Broken Access Control in Two-Factor-AuthenticationCVE-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
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