Vulnerability Description
Dagu is a workflow engine with a built-in Web user interface. Prior to 2.2.4, when Dagu is configured with HTTP Basic authentication (DAGU_AUTH_MODE=basic), all Server-Sent Events (SSE) endpoints are accessible without any credentials. This allows unauthenticated attackers to access real-time DAG execution data, workflow configurations, execution logs, and queue status — bypassing the authentication that protects the REST API. The buildStreamAuthOptions() function builds authentication options for SSE/streaming endpoints. When the auth mode is basic, it returns an auth.Options struct with BasicAuthEnabled: true but AuthRequired defaults to false (Go zero value). The authentication middleware at internal/service/frontend/auth/middleware.go allows unauthenticated requests when AuthRequired is false. This vulnerability is fixed in 2.2.4.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Dagu | Dagu | < 2.2.4 |
Related Weaknesses (CWE)
References
- https://github.com/dagu-org/dagu/commit/064616c9b80c04824c1c7c357308f77f3f24d775Patch
- https://github.com/dagu-org/dagu/pull/1752Issue TrackingPatch
- https://github.com/dagu-org/dagu/releases/tag/v2.2.4ProductRelease Notes
- https://github.com/dagu-org/dagu/security/advisories/GHSA-9wmw-9wph-2vwpExploitMitigationVendor Advisory
FAQ
What is CVE-2026-31882?
CVE-2026-31882 is a vulnerability with a CVSS score of 7.5 (HIGH). Dagu is a workflow engine with a built-in Web user interface. Prior to 2.2.4, when Dagu is configured with HTTP Basic authentication (DAGU_AUTH_MODE=basic), all Server-Sent Events (SSE) endpoints are ...
How severe is CVE-2026-31882?
CVE-2026-31882 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-31882?
Check the references section above for vendor advisories and patch information. Affected products include: Dagu Dagu.