Vulnerability-Lookup

CVE-2026-33638 (GCVE-0-2026-33638)

Vulnerability from cvelistv5 – Published: 2026-03-26 20:52 – Updated: 2026-03-27 20:19

Title

Ech0 authenticated user-list exposed data via public `/api/allusers` endpoint

Summary

Ech0 is an open-source, self-hosted publishing platform for personal idea sharing. Prior to version 4.2.0, `GET /api/allusers` is mounted as a public endpoint and returns user records without authentication. This allows remote unauthenticated user enumeration and exposure of user profile metadata. A fix is available in v4.2.0.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-27 20:18 UTC

CWE

CWE-862 - Missing Authorization

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/lin-snow/Ech0/security/advisor…	x_refsource_CONFIRM
https://github.com/lin-snow/Ech0/commit/acbf1fd71…	x_refsource_MISC
https://github.com/lin-snow/Ech0/releases/tag/v4.2.0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
lin-snow	Ech0	Affected: < 4.2.0	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-33638

Vulnerability from fkie_nvd - Published: 2026-03-26 21:17 - Updated: 2026-06-17 10:37

Severity

5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/lin-snow/Ech0/commit/acbf1fd71011e6b9e1e6a911128056a19862f681	Patch
security-advisories@github.com	https://github.com/lin-snow/Ech0/releases/tag/v4.2.0	Product, Release Notes
security-advisories@github.com	https://github.com/lin-snow/Ech0/security/advisories/GHSA-m983-7426-5hrj	Vendor Advisory

Impacted products

	Vendor	Product	Version
	ech0	ech0	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Ech0",
          "vendor": "lin-snow",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.2.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:ech0:ech0:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "10A3DFF1-8E0A-435D-BD3D-1615E472D006",
              "versionEndExcluding": "4.2.0",
              "vulnerable": true
            }
          ],
          "negate": false,
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    {
      "lang": "en",
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    },
    {
      "lang": "es",
      "value": "Ech0 es una plataforma de publicaci\u00f3n de c\u00f3digo abierto y autoalojada para compartir ideas personales. Antes de la versi\u00f3n 4.2.0, `GET /api/allusers` est\u00e1 montado como un endpoint p\u00fablico y devuelve registros de usuario sin autenticaci\u00f3n. Esto permite la enumeraci\u00f3n remota de usuarios no autenticados y la exposici\u00f3n de metadatos de perfil de usuario. Una soluci\u00f3n est\u00e1 disponible en la v4.2.0."
    }
  ],
  "id": "CVE-2026-33638",
  "lastModified": "2026-06-17T10:37:49.680",
  "metrics": {
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GHSA-M983-7426-5HRJ

Vulnerability from github – Published: 2026-03-24 22:25 – Updated: 2026-03-30 20:27

Summary

Ech0 authenticated user-list exposed data via public `/api/allusers` endpoint

Details

Summary

A public access-control flaw allows unauthenticated users to retrieve the full user list from GET /api/allusers. This exposes user profile metadata to anyone who can reach the application and enables remote user enumeration.

Details

The vulnerable route is registered as a public endpoint:

internal/router/user.go:17
appRouterGroup.PublicRouterGroup.GET("/allusers", h.UserHandler.GetAllUsers())

However, the handler appears to have been intended as an authenticated endpoint:

internal/handler/user/user.go:177-185
API annotations indicate an authentication requirement via @Security ApiKeyAuth

This creates a mismatch between the documented security model and the actual routing configuration. As a result, requests to GET /api/allusers succeed without authentication and return user records, including profile metadata such as usernames, email addresses, role-related flags, avatar values, and locale information.

A negative control against another endpoint that correctly requires authentication further supports that this exposure is unintended: GET /api/user returns 401 Unauthorized when no token is supplied, while GET /api/allusers remains publicly accessible.

Impact

Type: Access control bypass / unauthenticated data exposure
Who is impacted: Any deployment exposing the API to untrusted networks, and all users whose profile metadata is returned by the endpoint
Security impact: Enables remote user enumeration and disclosure of user profile metadata, which may facilitate account reconnaissance, phishing, and targeted credential attacks
Attack preconditions: None beyond network access to the affected API endpoint

Severity

5.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/lin-snow/ech0"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.4.8-0.20260322121226-acbf1fd71011"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-33638"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-24T22:25:03Z",
    "nvd_published_at": "2026-03-26T21:17:07Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\nA public access-control flaw allows unauthenticated users to retrieve the full user list from `GET /api/allusers`. This exposes user profile metadata to anyone who can reach the application and enables remote user enumeration.\n\n### Details\nThe vulnerable route is registered as a public endpoint:\n\n- `internal/router/user.go:17`\n  - `appRouterGroup.PublicRouterGroup.GET(\"/allusers\", h.UserHandler.GetAllUsers())`\n\nHowever, the handler appears to have been intended as an authenticated endpoint:\n\n- `internal/handler/user/user.go:177-185`\n  - API annotations indicate an authentication requirement via `@Security ApiKeyAuth`\n\nThis creates a mismatch between the documented security model and the actual routing configuration. As a result, requests to `GET /api/allusers` succeed without authentication and return user records, including profile metadata such as usernames, email addresses, role-related flags, avatar values, and locale information.\n\nA negative control against another endpoint that correctly requires authentication further supports that this exposure is unintended: `GET /api/user` returns `401 Unauthorized` when no token is supplied, while `GET /api/allusers` remains publicly accessible.\n\n### Impact\n- **Type:** Access control bypass / unauthenticated data exposure\n- **Who is impacted:** Any deployment exposing the API to untrusted networks, and all users whose profile metadata is returned by the endpoint\n- **Security impact:** Enables remote user enumeration and disclosure of user profile metadata, which may facilitate account reconnaissance, phishing, and targeted credential attacks\n- **Attack preconditions:** None beyond network access to the affected API endpoint",
  "id": "GHSA-m983-7426-5hrj",
  "modified": "2026-03-30T20:27:17Z",
  "published": "2026-03-24T22:25:03Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/lin-snow/Ech0/security/advisories/GHSA-m983-7426-5hrj"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33638"
    },
    {
      "type": "WEB",
      "url": "https://github.com/lin-snow/Ech0/commit/acbf1fd71011e6b9e1e6a911128056a19862f681"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/lin-snow/Ech0"
    },
    {
      "type": "WEB",
      "url": "https://github.com/lin-snow/Ech0/releases/tag/v4.2.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Ech0  authenticated user-list exposed data via public `/api/allusers` endpoint  "
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-33638 (GCVE-0-2026-33638)

FKIE_CVE-2026-33638

GHSA-M983-7426-5HRJ

Summary

Details

Impact

Tags

Sightings

Nomenclature

Related by attack behaviour