{"id":"CVE-2026-31882","aliases":["GHSA-9wmw-9wph-2vwp"],"url":"https://o3.security/vulnerability/CVE-2026-31882","summary":"Dagu SSE Authentication Bypass in Basic Auth Mode","details":"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.","published":"2026-03-13T19:28:25.615Z","modified":"2026-08-05T03:32:12.947035002Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"dagu","fixedVersion":"2.2.4"}],"fix":{"url":"https://github.com/dagu-org/dagu/commit/064616c9b80c04824c1c7c357308f77f3f24d775","label":"dagu-org/dagu@064616c"},"references":[{"type":"WEB","url":"https://github.com/dagu-org/dagu/releases/tag/v2.2.4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31882.json"},{"type":"ADVISORY","url":"https://github.com/dagu-org/dagu/security/advisories/GHSA-9wmw-9wph-2vwp"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31882"},{"type":"FIX","url":"https://github.com/dagu-org/dagu/commit/064616c9b80c04824c1c7c357308f77f3f24d775"},{"type":"FIX","url":"https://github.com/dagu-org/dagu/pull/1752"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-05T03:32:12.947035002Z"}}