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
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.
References
security-advisories@github.comhttps://github.com/lin-snow/Ech0/commit/acbf1fd71011e6b9e1e6a911128056a19862f681Patch
security-advisories@github.comhttps://github.com/lin-snow/Ech0/releases/tag/v4.2.0Product, Release Notes
security-advisories@github.comhttps://github.com/lin-snow/Ech0/security/advisories/GHSA-m983-7426-5hrjVendor Advisory
Impacted products
Vendor Product Version
ech0 ech0 *
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,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "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": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-33638",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-03-27T20:18:24.196051Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-03-26T21:17:07.467",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/lin-snow/Ech0/commit/acbf1fd71011e6b9e1e6a911128056a19862f681"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Product",
        "Release Notes"
      ],
      "url": "https://github.com/lin-snow/Ech0/releases/tag/v4.2.0"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/lin-snow/Ech0/security/advisories/GHSA-m983-7426-5hrj"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-862"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.