VULNERABILITY INTELLIGENCE

CVE-2025-65328

CVSS score6.5 MEDIUM
EPSS probability0.27%
CISA KEVNot currently listed
Published2026-01-05
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Description

Mega-Fence (webgate-lib.*) 25.1.914 and prior trusts the first value of the X-Forwarded-For (XFF) header as the client IP without validating a trusted proxy chain. An attacker can supply an arbitrary XFF value in a remote request to spoof the client IP, which is then propagated to security-relevant state (e.g., WG_CLIENT_IP cookie). Deployments that rely on this value for IP allowlists may be bypassed.

Weakness classification

  • CWE-807: Reliance on Untrusted Inputs in a Security Decision

Primary references