CVE-2026-119039: medium-severity vulnerability in Defender Security
Defender Security 4.9.0 - 6.4.0 - Unauthenticated IP Address Spoofing via Smart IP Detection
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.3epss 0.1%
The Defender Security WordPress plugin before 6.4.1 does not verify that the client IP address it derives for its firewall and lockout decisions actually originates from a trusted source, trusting a user-supplied value by default, allowing unauthenticated attackers to spoof their IP address and evade IP-based protections such as login lockout and IP banning, impersonate an allowlisted address, and poison the Defender Security WordPress plugin before 6.4.1's activity logs.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Affected products
Unknown · Defender SecurityRelated CVEs — Defender Security
In the same product, most dangerous first.
CVE-2023-5089MEDIUMDefender Security < 4.1.0 - Protection Bypass (Hidden Login Page)EPSS 2.5%CVE-2026-19225MEDIUMDefender Security < 6.2.0 - Admin+ Network-Wide RCE via Hub Connector on MultisiteEPSS 0.5%CVE-2026-119040HIGHDefender Security < 6.4.1 - 2FA Bypass via Unthrottled OTP VerificationEPSS 0.2%