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

Quick assessment

Affected
coder coder
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Coder 2.34.7 之前的版本在 中间件中存在的 IP 欺骗漏洞，会信任客户端提供的最左侧 值，而非反向代理附加的真实客户端 IP。攻击者可通过在代理链中伪造 值，绕过登录、一次性密码（OTP）及密码验证等接口的每 IP 速率限制，从而发动暴力破解攻击，并篡改审计日志中记录的 IP 地址。

CVSS 3.7 · Low EPSS 0.12% · P2

Affected Version Matrix 2

VendorProduct Version RangeStatus
coder coder < 2.34.7 affected
2.34.7 unaffected
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I. Basic Information for CVE-2026-111934

Vulnerability Information
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Vulnerability Title
Coder before 2.34.7 IP Spoofing via X-Forwarded-For Header
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用不可信的源
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
coder coder 0 ~ 2.34.7 -

II. Public POCs for CVE-2026-111934

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III. Intelligence Information for CVE-2026-111934

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Vendor Advisories for CVE-2026-111934 (2)

Same Patch Batch · coder · 2026-10-17 · 11 CVEs total

CVE-2026-111927 7.7 HIGH Coder before 2.35.4 Credential Theft via Workspace Proxy Hostname Prefix Match
CVE-2026-111928 5.4 MEDIUM Coder 2.0.0 before 2.34.8 Authorization Bypass via User-Level ACL in RBAC Policy
CVE-2026-111929 5.3 MEDIUM Coder 2.30.0 before 2.34.8 Cross-Organization File Disclosure via DownloadFile RPC
CVE-2024-58398 4.3 MEDIUM Coder 2.3.1 before 2.16.1 Open Redirect via Login Page redirect Parameter
CVE-2026-111930 4.3 MEDIUM Coder from 2.26.0 before 2.34.8 Information Disclosure via Workspace ACL Endpoint
CVE-2026-111931 4.3 MEDIUM Coder 2.0.0 before 2.34.8 Open Redirect via Workspace App Proxy
CVE-2025-71435 4.2 MEDIUM Coder before 2.23.0 Session Expiration Bypass via OIDC Without Refresh Token
CVE-2026-111933 3.7 LOW Coder before 2.34.2 User Enumeration via Login Placeholder Hash
CVE-2026-111932 3.4 LOW Coder before 2.34.2 Stored HTML Injection via Appearance Settings
CVE-2026-111926 3.3 LOW Coder from 2.10.0 before 2.34.8 Information Disclosure via Agent /debug/manifest

IV. Related Vulnerabilities

Same product: coder
Same vendor: coder
Same weakness: CWE-348

V. Comments for CVE-2026-111934

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