IP allowlist bypass via untrusted X-Forwarded-For
Published Jan 5, 2026 · Updated Jan 5, 2026
Reliance on untrusted input in Mega-Fence 25.1.914 and earlier allows remote attackers to bypass IP-based controls via crafted requests. The WG_GetUserAddress(HttpServletRequest) function accepts the first X-Forwarded-For value without verifying a trusted proxy chain and stores it in downstream state such as the WG_CLIENT_IP cookie. Exploitation requires a deployment that uses the derived address for an IP allowlist or another security decision; the default configuration uses it only for logging.
Summary
What happened
Reliance on untrusted input in Mega-Fence 25.1.914 and earlier allows remote attackers to bypass IP-based controls via crafted requests. The WG_GetUserAddress(HttpServletRequest) function accepts the first X-Forwarded-For value without verifying a trusted proxy chain and stores it in downstream state such as the WG_CLIENT_IP cookie. Exploitation requires a deployment that uses the derived address for an IP allowlist or another security decision; the default configuration uses it only for logging.
The record
- CVE
- CVE-2025-65328
- Published
- Jan 5, 2026
- Updated
- Jan 5, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-807, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 5, 2026CVE publishedPublication date reported by the CVE source.
- Jan 5, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- X-Forwarded-For spoofing minimal reproductionproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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