Vulnerability in Coder
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.
Published .
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/coder/coder/security/advisories/GHSA-vprw-xcrv-287h (vendor-advisory)
- www.vulncheck.com/advisories/coder-before-2.34.7-ip-spoofing-via-x-forwarded-fo… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111934?
- CVE-2026-111934 is a low-severity vulnerability in Coder, classified under CWE-348. CVSS score: 3.7/10. Published 2026-10-17.
- How severe is CVE-2026-111934?
- Low severity. CVSS v3 base score is 3.7 out of 10.