CVE-2025-65328

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-01-05 · updated 2026-06-17
Weakness: CWE-807

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.

Affected products

Mega-Fence Project Mega-Fence: through 25.1.914

References

https://drive.proton.me/urls/MY05PVBFXG#xDd2Xqy98WM9
https://raw.githubusercontent.com/p1aintext/CVE/main/CVE-2025-65328.md

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