What’s Vulnerable › Vulnerabilities

CVE-2026-31882: Dagu SSE Authentication Bypass in Basic Auth Mode

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-13 · updated 2026-06-17
• Weakness: CWE-306

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.

Affected products

• dagu-org dagu: before 2.2.4 — fixed in 2.2.4

How to fix

Upgrade to a fixed version: dagu-org dagu 2.2.4. Check the vendor advisory for mitigations.

References

• https://github.com/dagu-org/dagu/commit/064616c9b80c04824c1c7c357308f77f3f24d775
• https://github.com/dagu-org/dagu/pull/1752
• https://github.com/dagu-org/dagu/releases/tag/v2.2.4
• https://github.com/dagu-org/dagu/security/advisories/GHSA-9wmw-9wph-2vwp

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