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CVE-2017-8810

Status: ModifiedHigh (7.5)—

MediaWiki before 1.27.4, 1.28.x before 1.28.3, and 1.29.x before 1.29.2, when a private wiki is configured, provides different error messages for failed login attempts depending on whether the username exists, which allows remote attackers to enumerate account names and conduct brute-force attacks via a series of requests.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (2)

Debian — Debian LinuxMediawiki — Mediawiki

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2017-8810",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.0",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security@debian.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "MediaWiki before 1.27.4, 1.28.x before 1.28.3, and 1.29.x before 1.29.2",
          "versions": [
            {
              "status": "affected",
              "version": "MediaWiki before 1.27.4, 1.28.x before 1.28.3, and 1.29.x before 1.29.2"
            }
          ]
        }
      ]
    }
  ],
  "published": "2017-11-15T08:29:00.673",
  "references": [
    {
      "url": "http://www.securitytracker.com/id/1039812",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "source": "security@debian.org"
    },
    {
      "url": "https://lists.wikimedia.org/pipermail/mediawiki-announce/2017-November/000216.html",
      "tags": [
        "Mailing List",
        "Patch",
        "Vendor Advisory"
      ],
      "source": "security@debian.org"
    },
    {
      "url": "https://www.debian.org/security/2017/dsa-4036",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "security@debian.org"
    },
    {
      "url": "http://www.securitytracker.com/id/1039812",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://lists.wikimedia.org/pipermail/mediawiki-announce/2017-November/000216.html",
      "tags": [
        "Mailing List",
        "Patch",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.debian.org/security/2017/dsa-4036",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-200"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "MediaWiki before 1.27.4, 1.28.x before 1.28.3, and 1.29.x before 1.29.2, when a private wiki is configured, provides different error messages for failed login attempts depending on whether the username exists, which allows remote attackers to enumerate account names and conduct brute-force attacks via a series of requests."
    },
    {
      "lang": "es",
      "value": "MediaWiki en versiones anteriores a la 1.27.4; las versiones 1.28.x anteriores a la 1.28.3 y las versiones 1.29.x anteriores a la 1.29.2, cuando se ha configurado una wiki privada, proporciona diferentes mensajes de error para intentos de inicio de sesión fallidos dependiendo de si existe el nombre de usuario. Esto permite que atacantes remotos enumeren nombres de cuentas y lleven a cabo ataques de fuerza bruta mediante una serie de peticiones."
    }
  ],
  "lastModified": "2026-06-17T01:27:00.163",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "2825F885-DD77-4822-B659-D5AFB56C6B17",
              "versionEndIncluding": "1.27.3"
            },
            {
              "criteria": "cpe:2.3:a:mediawiki:mediawiki:1.28.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "70CAB8A9-39D5-41F4-800C-79E4FE57B12D"
            },
            {
              "criteria": "cpe:2.3:a:mediawiki:mediawiki:1.28.1:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A060BA59-05C8-4646-97D7-4F382B4EBCC6"
            },
            {
              "criteria": "cpe:2.3:a:mediawiki:mediawiki:1.28.2:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E67B837B-D085-4EE4-9556-D25BFA9BC108"
            },
            {
              "criteria": "cpe:2.3:a:mediawiki:mediawiki:1.29.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "CFA5659C-9DEA-494E-BB32-E6573E180C26"
            },
            {
              "criteria": "cpe:2.3:a:mediawiki:mediawiki:1.29.1:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "9A457BE6-9F2F-45C9-A650-46F7E4B77E20"
            }
          ],
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "DEECE5FC-CACF-4496-A3E7-164736409252"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security@debian.org"
}