CVE-2025-65328: Mega-Fence (webgate-lib.*) 25.1.914 and prior trusts the first value of the X-Forwarded-For (XFF) header as th

Q: How do I fix CVE-2025-65328?

mega-fence: upgrade to newer than 25.1.914. Exact commands for each OS are on this page.

Q: Is CVE-2025-65328 being exploited?

CVE-2025-65328 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-65328 affect?

CVE-2025-65328 affects mega-fence. Severity is medium (CVSS 6.5). 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 t

Q: How urgent is CVE-2025-65328?

Priority 38/100. Public exploit reference; Remotely exploitable, no login, no user action

This week

MEDIUM 6.5REMOTEUPGRADE

CVE-2025-65328 is a medium-severity flaw (CVSS 6.5) affecting mega-fence. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 81%)
CISA exploited list	No
Weakness	CWE-807
Published	2026-01-05
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mega-fence project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-01-05 16:15 UTCPublished CVE record published
2026-06-17 09:55 UTCUpdated Record last modified

mega-fence project mega-fence UPGRADE

Affected: <= 25.1.914

Fixed in: newer than 25.1.914

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mega-fence || rpm -q mega-fence || mega-fence --version

2. UPGRADE to newer than 25.1.914 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mega-fence

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mega-fence

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-65328?

mega-fence: upgrade to newer than 25.1.914. Exact commands for each OS are on this page.

Is CVE-2025-65328 being exploited?

CVE-2025-65328 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-65328 affect?

CVE-2025-65328 affects mega-fence. Severity is medium (CVSS 6.5). 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 t

How urgent is CVE-2025-65328?

Priority 38/100. Public exploit reference; Remotely exploitable, no login, no user action

References

← Back to latest CVEs