{"id":"CVE-2026-111934","title":"Coder before 2.34.7 IP Spoofing via X-Forwarded-For Header","summary":"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 for…","severity":"low","cvss":3.7,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","cvssSource":"cna","cwe":["CWE-348"],"vendor":"coder","product":"coder","affected":["coder < 2.34.7"],"published":"2026-10-17","updated":"2026-10-17","sourceUpdated":"2026-10-17T18:46:44.142Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-111934","references":[{"url":"https://github.com/coder/coder/security/advisories/GHSA-vprw-xcrv-287h","label":"GitHub Security Advisory (GHSA-vprw-xcrv-287h)"},{"url":"https://www.vulncheck.com/advisories/coder-before-2.34.7-ip-spoofing-via-x-forwarded-for-header","label":"VulnCheck Advisory: Coder before 2.34.7 IP Spoofing via X-Forwarded-For Header"}],"tags":["cve.org"],"ingestedAt":"2026-10-17T19:08:56.501Z","slug":"CVE-2026-111934","body":"## Overview\n\nCoder 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.\n\n## Affected\n\n- `coder < 2.34.7`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":20,"depthScoreParts":{"impact":20.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}