What’s Vulnerable › Vulnerabilities

CVE-2026-111934: Coder before 2.34.7 IP Spoofing via X-Forwarded-For Header

• Severity: low (CVSS 3.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-17 · updated 2026-10-24
• Weakness: CWE-348

Description

Coder before 2.34.7 contains an IP spoofing vulnerability in the ExtractRealIPAddress middleware that trusts the leftmost, client-supplied X-Forwarded-For value instead of the client IP appended by a reverse proxy. Attackers can send forged X-Forwarded-For values through appending proxies to bypass per-IP rate limits on login, one-time passcode, and password validation endpoints, enabling brute-force attacks, and to falsify IP addresses recorded in audit logs.

Affected products

• coder: before 2.34.7 — fixed in 2.34.7

How to fix

Upgrade to a fixed version: coder 2.34.7. Check the vendor advisory for mitigations.

References

• https://github.com/coder/coder/security/advisories/GHSA-vprw-xcrv-287h
• https://www.vulncheck.com/advisories/coder-before-2.34.7-ip-spoofing-via-x-forwarded-for-header

Get alerted when CVE-2026-111934 or the next vulnerability affects your stack