Origin Validation Error Affecting github.com/coder/coder/coderd/workspaceapps/apptest package, versions >=0.0.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMCODERCODERCODERDWORKSPACEAPPSAPPTEST-17872194
- published6 Jul 2026
- disclosed6 Jul 2026
- creditUnknown
Introduced: 6 Jul 2026
CVE-2026-55438 (opens in a new tab)How to fix?
There is no fixed version for github.com/coder/coder/coderd/workspaceapps/apptest.
Overview
Affected versions of this package are vulnerable to Origin Validation Error via the CORS origin validation process. An attacker can gain unauthorized access to sensitive data by crafting a subdomain that encodes their own workspace UUID and a victim's username, then tricking an authenticated victim into visiting the malicious URL, allowing credentialed cross-origin requests to be made and responses to be read.