Vulnerability in Coder
CVE-2026-111927
Coder before 2.29.20, 2.33.0 before 2.33.12, 2.34.0 before 2.34.8, and 2.35.0 before 2.35.4 contains an improper hostname validation flaw in GetWorkspaceProxyByHostname whose SIMILAR TO pattern performs a prefix match, so any domain that is a string prefix of a workspace-proxy access URL is trusted as a proxy. Attackers owning such a domain can lure an authenticated victim to a crafted /api/v2/applications/auth-redirect link, capture the redirected application_connect API key, and replay it to access the victim's workspace apps.
Published .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/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-h58h-qvv5-xvwg (vendor-advisory)
- www.vulncheck.com/advisories/coder-before-2.35.4-credential-theft-via-workspace… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111927?
- CVE-2026-111927 is a high-severity vulnerability in Coder, classified under Insufficiently Protected Credentials. CVSS score: 7.7/10. Published 2026-10-17.
- How severe is CVE-2026-111927?
- High severity. CVSS v3 base score is 7.7 out of 10.