CVE-2026-111934

Coder before 2.34.7 IP Spoofing via X-Forwarded-For Header

Published Oct 17, 2026 CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed

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

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

coder

unaffected

Version	Status	Constraints
`0`	affected	< 2.34.7
`2.34.7`	unaffected	—

No data.

Vendor Product Versions

Coder

Version	Status	Scheme	Platform
`[0,2.34.7)`	affected	semver	—
`2.34.7`	unaffected	semver	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.123% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
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

History

Oct 19, 2026 5:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Oct 17, 2026 7:00 PM Description updated. Title updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
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.
Title		Coder before 2.34.7 IP Spoofing via X-Forwarded-For Header
First Time appeared		Coder Coder coder
Weaknesses		CWE-348
CPEs		cpe:2.3:a:coder:coder::::::::
Vendors & Products		Coder Coder coder
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
Metrics		cvssV3_1 `{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N'}` cvssV4_0 `{'score': 6.3, 'vector': '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'}`