CVE-2026-111934

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.

CVSS v3 3.7 LOW

3.7^/10

CVSS v3 : LOW

Vector :

Exploitability : 2.2 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
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

Configurations

No configuration.

History

19 Oct 2026, 22:10

Type	Values Removed	Values Added
Summary		(es) Coder versiones anteriores a 2.34.7 contiene una vulnerabilidad de suplantación de IP en el middleware ExtractRealIPAddress que confía en el valor X-Forwarded-For suministrado por el cliente que está más a la izquierda, en lugar de la IP del cliente añadida por un proxy inverso. Los atacantes pueden enviar valores falsificados de X-Forwarded-For mediante proxies intermedios para eludir los límites de velocidad por IP en los endpoints de inicio de sesión, códigos de un solo uso y validación de contraseñas, lo que permite ataques de fuerza bruta y falsificar direcciones IP registradas en los registros de auditoría.

17 Oct 2026, 19:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-17 19:16

Updated : 2026-10-24 19:10

NVD link : CVE-2026-111934

Mitre link : CVE-2026-111934

CVE.ORG link : CVE-2026-111934

JSON object : View

Products Affected

No product.

CWE

CWE-348

Use of Less Trusted Source

{"id": "CVE-2026-111934", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-111934", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-19T15:35:37.487571Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 3.7, "attackVector": "NETWORK", "baseSeverity": "LOW", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 2.2}], "cvssMetricV40": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.3, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "LOW", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "disclosure@vulncheck.com", "affectedData": [{"vendor": "coder", "product": "coder", "versions": [{"status": "affected", "version": "0", "lessThan": "2.34.7", "versionType": "semver"}, {"status": "unaffected", "version": "2.34.7", "versionType": "semver"}], "packageURL": "pkg:golang/github.com/coder/coder/v2", "defaultStatus": "unaffected"}]}], "published": "2026-10-17T19:16:36.497", "references": [{"url": "https://github.com/coder/coder/security/advisories/GHSA-vprw-xcrv-287h", "source": "disclosure@vulncheck.com"}, {"url": "https://www.vulncheck.com/advisories/coder-before-2.34.7-ip-spoofing-via-x-forwarded-for-header", "source": "disclosure@vulncheck.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "description": [{"lang": "en", "value": "CWE-348"}]}], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Coder versiones anteriores a 2.34.7 contiene una vulnerabilidad de suplantaci\u00f3n de IP en el middleware ExtractRealIPAddress que conf\u00eda en el valor X-Forwarded-For suministrado por el cliente que est\u00e1 m\u00e1s a la izquierda, en lugar de la IP del cliente a\u00f1adida por un proxy inverso. Los atacantes pueden enviar valores falsificados de X-Forwarded-For mediante proxies intermedios para eludir los l\u00edmites de velocidad por IP en los endpoints de inicio de sesi\u00f3n, c\u00f3digos de un solo uso y validaci\u00f3n de contrase\u00f1as, lo que permite ataques de fuerza bruta y falsificar direcciones IP registradas en los registros de auditor\u00eda."}], "lastModified": "2026-10-24T19:10:00.127", "sourceIdentifier": "disclosure@vulncheck.com"}