Improper Hostname Validation in Coder Products
CVE-2026-111927

8.7HIGH

Key Information:

Vendor

Coder

Status
Coder
Vendor
CVE Published:
17 October 2026

What is CVE-2026-111927?

The Coder platform has a vulnerability related to improper hostname validation in its GetWorkspaceProxyByHostname API. This flaw allows malicious actors to exploit a prefix matching pattern, where any domain that matches the beginning of a workspace proxy access URL is inaccurately trusted. As a result, attackers can deceive authenticated users into clicking on a crafted application redirect link, leading to the interception of sensitive API keys. Once captured, these keys can be misused to gain unauthorized access to users' workspace applications, posing a significant security risk.

Affected Version(s)

coder 2.35.0 < 2.35.4

coder 2.34.0 < 2.34.8

coder 2.33.0 < 2.33.12

References

https://github.com/coder/coder/security/advisories/GHSA-h...
vendor-advisory
https://www.vulncheck.com/advisories/coder-before-2.35.4-...
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.