CVE-2026-31882
Dagu SSE Authentication Bypass in Basic Auth Mode
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.
INFO
Published Date :
March 13, 2026, 7:54 p.m.
Last Modified :
March 18, 2026, 8:14 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update Dagu to version 2.2.4 or later.
- Ensure HTTP Basic authentication is properly configured.
- Verify SSE endpoints require credentials.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-31882.
| URL | Resource |
|---|---|
| https://github.com/dagu-org/dagu/commit/064616c9b80c04824c1c7c357308f77f3f24d775 | Patch |
| https://github.com/dagu-org/dagu/pull/1752 | Issue Tracking Patch |
| https://github.com/dagu-org/dagu/releases/tag/v2.2.4 | Product Release Notes |
| https://github.com/dagu-org/dagu/security/advisories/GHSA-9wmw-9wph-2vwp | Exploit Mitigation Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-31882 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-31882
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-31882 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-31882 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Mar. 18, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:dagu:dagu:*:*:*:*:*:*:*:* versions up to (excluding) 2.2.4 Added Reference Type GitHub, Inc.: https://github.com/dagu-org/dagu/commit/064616c9b80c04824c1c7c357308f77f3f24d775 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/dagu-org/dagu/pull/1752 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/dagu-org/dagu/releases/tag/v2.2.4 Types: Product, Release Notes Added Reference Type GitHub, Inc.: https://github.com/dagu-org/dagu/security/advisories/GHSA-9wmw-9wph-2vwp Types: Exploit, Mitigation, Vendor Advisory -
New CVE Received by [email protected]
Mar. 13, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Added CWE CWE-306 Added Reference https://github.com/dagu-org/dagu/commit/064616c9b80c04824c1c7c357308f77f3f24d775 Added Reference https://github.com/dagu-org/dagu/pull/1752 Added Reference https://github.com/dagu-org/dagu/releases/tag/v2.2.4 Added Reference https://github.com/dagu-org/dagu/security/advisories/GHSA-9wmw-9wph-2vwp