{"id":"CVE-2026-111934","summary":"Coder before 2.34.7 IP Spoofing via X-Forwarded-For Header","details":"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.","aliases":["GHSA-vprw-xcrv-287h"],"modified":"2026-10-18T10:46:14.909753908Z","published":"2026-10-17T18:46:44.142Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111934.json","cna_assigner":"VulnCheck","cwe_ids":["CWE-348"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111934.json"},{"type":"ADVISORY","url":"https://github.com/coder/coder/security/advisories/GHSA-vprw-xcrv-287h"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-111934"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/coder-before-2.34.7-ip-spoofing-via-x-forwarded-for-header"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/coder/coder","events":[{"introduced":"0"},{"fixed":"b7d2742adc3ca28c3619f807799dd121d7f49247"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0"},{"fixed":"2.34.7"}]}}],"versions":["v2.34.6","v2.34.5","v2.34.4","v2.34.3","v2.34.2","v2.34.1","v2.34.0","v2.34.0-rc.0","v2.33.0-rc.3","v2.33.0-rc.2","v2.33.0-rc.0","v2.33.0-rc.1","v2.32.0-rc.0","v2.10.0","v2.9.0","v2.6.0","v2.8.0","v2.7.1","v2.7.0","v2.5.1","v2.5.0","v2.4.0","v2.3.3","v2.3.2","v2.3.1","v2.3.0","v2.2.1","v2.1.5","v2.1.4","v2.1.3","v2.1.2","v2.1.1","v2.0.2","v0.27.1","v0.27.0","v0.26.2","v0.26.1","v0.26.0","v0.25.0","v0.24.1","v0.24.0","v0.23.7","v0.23.6","v0.23.5","v0.23.4","v0.23.3","v0.23.2","v0.23.1","v0.23.0","v0.22.2","v0.22.1","v0.22.0","v0.21.3","v0.21.2","v0.21.1","v0.21.0","v0.20.1","v0.20.0","v0.19.2","v0.19.1","v0.19.0","v0.18.1","v0.18.0","v0.17.4","v0.17.3","v0.17.2","v0.17.1","v0.17.0","v0.16.0","v0.15.3","v0.15.2","v0.15.1","v0.15.0","v0.14.3","v0.14.2","v0.14.1","v0.14.0","v0.13.6","v0.13.5","v0.13.4","v0.13.3","v0.13.2","v0.13.1","v0.13.0","v0.12.9","v0.12.8","v0.12.7","v0.12.6","v0.12.5","v0.12.4","v0.12.3","v0.12.2","v0.12.1","v0.12.0","v0.11.0","v0.10.2","v0.10.1","v0.10.0","rm","v0.9.10","v0.9.9","v0.9.8","v0.9.7","v0.9.6","v0.9.5","v0.9.4","v0.9.3","v0.9.2","v0.9.1","v0.9.0","v0.8.15","v0.8.14","v0.8.13","v0.8.12","v0.8.11","v0.8.10","v0.8.9","v0.8.8","v0.8.7","v0.8.6","v0.8.5","v0.8.4","v0.8.3","v0.8.2","v0.8.1","v0.8.0","v0.7.12","v0.7.11","v0.7.10","v0.7.9","v0.7.8","v0.7.7","v0.7.6","v0.7.5","v0.7.4","v0.7.3","v0.7.2","v0.7.1","v0.7.0","v0.6.6","v0.6.5","v0.6.4","v0.6.3","v0.6.2","v0.6.1","v0.6.0","v0.5.11","v0.5.10","v0.5.9","v0.5.8","v0.5.7","v0.5.6","v0.5.5","v0.5.4","v0.5.3","v0.5.2","v0.5.1","v0.5.0","v0.4.4","v0.4.3","v0.4.2","v0.4.1","v0.4.0","v0.3.5","v0.3.4","v0.3.3","v0.3.2","v0.3.1","v0.3.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-111934.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"}]}