Vulnerability · Published Oct 17, 2026 · Assigned by VulnCheck

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

Low 3.7

In plain English

A low-severity security flaw in coder from coder. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities).

Severity (CVSS 3.1)3.7Low

Exploit odds (30 days)0.1%top 97.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
coder	coder	0 – before 2.34.7

Weakness: CWE-348 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

References

GitHub Security Advisory (GHSA-vprw-xcrv-287h) vendor-advisory
VulnCheck Advisory: Coder before 2.34.7 IP Spoofing via X-Forwarded-For Header third-party-advisory