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CVE-2026-44255

Estado: AnalizadaMedia (5.3)—

Wazuh is a free and open source platform used for threat prevention, detection, and response. From 4.0.0 until 4.14.6 and 5.0.0-beta2, AuthenticationManager.check_user() in framework/wazuh/rbac/orm.py performs check_password_hash() only when the supplied username exists. A nonexistent username returns immediately, while a valid username causes an expensive bcrypt calculation. An unauthenticated remote attacker can compare authentication response times to enumerate valid Wazuh usernames and use that information in subsequent credential attacks. This issue is fixed in versions 4.14.6 and 5.0.0-beta2.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Wazuh — Wazuh

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-44255",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-44255",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-08-25T02:16:49.674139Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.3,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "wazuh",
          "product": "wazuh",
          "versions": [
            {
              "status": "affected",
              "version": ">= 4.0.0, < 4.14.6"
            },
            {
              "status": "affected",
              "version": ">= 5.0.0-beta1, < 5.0.0-beta2"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-08-19T17:18:48.770",
  "references": [
    {
      "url": "https://github.com/wazuh/wazuh/commit/5ecea7b38b998407cb0d205467dd247140a0f981",
      "tags": [
        "Patch"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/wazuh/wazuh/pull/35757",
      "tags": [
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        "Patch"
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      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/wazuh/wazuh/releases/tag/v4.14.6",
      "tags": [
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      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/wazuh/wazuh/releases/tag/v5.0.0-beta2",
      "tags": [
        "Release Notes"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/wazuh/wazuh/security/advisories/GHSA-3978-44q9-9px9",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/wazuh/wazuh/security/advisories/GHSA-3978-44q9-9px9",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-208"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Wazuh is a free and open source platform used for threat prevention, detection, and response. From 4.0.0 until 4.14.6 and 5.0.0-beta2, AuthenticationManager.check_user() in framework/wazuh/rbac/orm.py performs check_password_hash() only when the supplied username exists. A nonexistent username returns immediately, while a valid username causes an expensive bcrypt calculation. An unauthenticated remote attacker can compare authentication response times to enumerate valid Wazuh usernames and use that information in subsequent credential attacks. This issue is fixed in versions 4.14.6 and 5.0.0-beta2."
    }
  ],
  "lastModified": "2026-09-18T14:52:15.250",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:wazuh:wazuh:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E34130E3-89D7-4413-B1F0-0434248CD325",
              "versionEndExcluding": "4.14.6",
              "versionStartIncluding": "4.0.0"
            },
            {
              "criteria": "cpe:2.3:a:wazuh:wazuh:5.0.0:beta1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "007B01AA-AED0-4E92-8999-07E74B630460"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security-advisories@github.com"
}