CVE-2026-55438

The record

Coder allows organizations to provision remote development environments via Terraform. Prior to versions 2.29.17, 2.32.7, 2.33.8, and 2.34.2, Coder's subdomain-based workspace app proxy allowed the same-owner CORS check to be bypassed. When a workspace-name subdomain segment parsed as a UUID, the workspace was resolved by ID without confirming the URL's username matched the real owner, while the CORS middleware trusted the unverified username in the hostname. Practical exploitation requires subdomain app routing (wildcard hostname) enabled and a victim who visits the attacker's crafted app URL while authenticated. The fix in versions 2.29.17, 2.32.7, 2.33.8, and 2.34.2 validates the subdomain username against the resolved workspace's actual owner and bases the same-owner CORS decision on the authoritative owner identity. No known workarounds are available.

Affected packages

Related vulnerabilities

• CVE-2026-114125 Storybook is a frontend workshop for building user interface components and pages in… CWE-346
• CVE-2026-107230 The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP… CWE-346
• CVE-2026-94485 Next.js is a React framework for building full-stack web applications. CWE-346
• CVE-2026-94486 Next.js is a React framework for building full-stack web applications. CWE-346
• CVE-2026-77119 A validly signed NSEC3 from an unrelated sibling zone may be accepted as an insecurity… CWE-346
• CVE-2026-87563 Origin validation error in Paint in Google Chrome prior to 153.0.8010.36 allowed a remote… CWE-346
• CVE-2026-85152 undici 8.10.0 omits the destination origin from the cache and request-deduplication keys… CWE-346
• CVE-2026-84482 WWBN AVideo through commit 9c39d8c8 contains a cross-site request forgery vulnerability… CWE-346