CVE-2026-44255 (GCVE-0-2026-44255)

Vulnerability from cvelistv5 – Published: 2026-08-19 16:15 – Updated: 2026-08-19 16:15
VLAI
Title
Wazuh: Username Enumeration via Timing Side-Channel
Summary
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.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE
  • CWE-208 - Observable Timing Discrepancy
Assigner
References
Impacted products
Vendor Product Version CPE status
wazuh wazuh Affected: >= 4.0.0, < 4.14.6
Affected: >= 5.0.0-beta1, < 5.0.0-beta2
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "wazuh",
          "vendor": "wazuh",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 4.0.0, \u003c 4.14.6"
            },
            {
              "status": "affected",
              "version": "\u003e= 5.0.0-beta1, \u003c 5.0.0-beta2"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-208",
              "description": "CWE-208: Observable Timing Discrepancy",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:15:19.929Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/wazuh/wazuh/security/advisories/GHSA-3978-44q9-9px9",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/wazuh/wazuh/security/advisories/GHSA-3978-44q9-9px9"
        },
        {
          "name": "https://github.com/wazuh/wazuh/pull/35757",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/wazuh/wazuh/pull/35757"
        },
        {
          "name": "https://github.com/wazuh/wazuh/commit/5ecea7b38b998407cb0d205467dd247140a0f981",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/wazuh/wazuh/commit/5ecea7b38b998407cb0d205467dd247140a0f981"
        },
        {
          "name": "https://github.com/wazuh/wazuh/releases/tag/v4.14.6",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/wazuh/wazuh/releases/tag/v4.14.6"
        },
        {
          "name": "https://github.com/wazuh/wazuh/releases/tag/v5.0.0-beta2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/wazuh/wazuh/releases/tag/v5.0.0-beta2"
        }
      ],
      "source": {
        "advisory": "GHSA-3978-44q9-9px9",
        "discovery": "UNKNOWN"
      },
      "title": "Wazuh: Username Enumeration via Timing Side-Channel"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-44255",
    "datePublished": "2026-08-19T16:15:19.929Z",
    "dateReserved": "2026-05-05T16:33:55.844Z",
    "dateUpdated": "2026-08-19T16:15:19.929Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-44255\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-08-19T17:18:48.770\",\"lastModified\":\"2026-08-19T17:18:48.770\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"wazuh\",\"product\":\"wazuh\",\"versions\":[{\"version\":\"\u003e= 4.0.0, \u003c 4.14.6\",\"status\":\"affected\"},{\"version\":\"\u003e= 5.0.0-beta1, \u003c 5.0.0-beta2\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N\",\"baseScore\":5.3,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":3.9,\"impactScore\":1.4}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-208\"}]}],\"references\":[{\"url\":\"https://github.com/wazuh/wazuh/commit/5ecea7b38b998407cb0d205467dd247140a0f981\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/wazuh/wazuh/pull/35757\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/wazuh/wazuh/releases/tag/v4.14.6\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/wazuh/wazuh/releases/tag/v5.0.0-beta2\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/wazuh/wazuh/security/advisories/GHSA-3978-44q9-9px9\",\"source\":\"security-advisories@github.com\"}]}}"
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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

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.