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CVE-2021-26296

Status: ModifiedHigh (7.5)—

In the default configuration, Apache MyFaces Core versions 2.2.0 to 2.2.13, 2.3.0 to 2.3.7, 2.3-next-M1 to 2.3-next-M4, and 3.0.0-RC1 use cryptographically weak implicit and explicit cross-site request forgery (CSRF) tokens. Due to that limitation, it is possible (although difficult) for an attacker to calculate a future CSRF token value and to use that value to trick a user into executing unwanted actions on an application.

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)

Apache — MyfacesNetapp — Oncommand Insight

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2021-26296",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5.1,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:H/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "HIGH",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 4.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.6
      }
    ]
  },
  "affected": [
    {
      "source": "security@apache.org",
      "affectedData": [
        {
          "vendor": "Apache Software Foundation",
          "product": "Apache MyFaces Core",
          "versions": [
            {
              "status": "affected",
              "version": "Apache MyFaces Core 2.2",
              "lessThan": "2.2.14",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "Apache MyFaces Core 2.3",
              "lessThan": "2.3.8",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "Apache MyFaces Core 2.3-next",
              "lessThan": "2.3-next-M5",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "Apache MyFaces Core 3.0",
              "lessThan": "3.0.0",
              "versionType": "custom"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-02-19T09:15:13.283",
  "references": [
    {
      "url": "http://packetstormsecurity.com/files/161484/Apache-MyFaces-2.x-Cross-Site-Request-Forgery.html",
      "tags": [
        "Exploit",
        "Third Party Advisory",
        "VDB Entry"
      ],
      "source": "security@apache.org"
    },
    {
      "url": "http://seclists.org/fulldisclosure/2021/Feb/66",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
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      "source": "security@apache.org"
    },
    {
      "url": "https://lists.apache.org/thread.html/r2b73e2356c6155e9ec78fdd8f72a4fac12f3e588014f5f535106ed9b%40%3Cannounce.apache.org%3E",
      "tags": [
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      "source": "security@apache.org"
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      "url": "https://security.netapp.com/advisory/ntap-20210528-0007/",
      "tags": [
        "Third Party Advisory"
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      "source": "security@apache.org"
    },
    {
      "url": "http://packetstormsecurity.com/files/161484/Apache-MyFaces-2.x-Cross-Site-Request-Forgery.html",
      "tags": [
        "Exploit",
        "Third Party Advisory",
        "VDB Entry"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://seclists.org/fulldisclosure/2021/Feb/66",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://lists.apache.org/thread.html/r2b73e2356c6155e9ec78fdd8f72a4fac12f3e588014f5f535106ed9b%40%3Cannounce.apache.org%3E",
      "tags": [
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security@apache.org",
      "description": [
        {
          "lang": "en",
          "value": "CWE-352"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-352"
        }
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    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the default configuration, Apache MyFaces Core versions 2.2.0 to 2.2.13, 2.3.0 to 2.3.7, 2.3-next-M1 to 2.3-next-M4, and 3.0.0-RC1 use cryptographically weak implicit and explicit cross-site request forgery (CSRF) tokens. Due to that limitation, it is possible (although difficult) for an attacker to calculate a future CSRF token value and to use that value to trick a user into executing unwanted actions on an application."
    },
    {
      "lang": "es",
      "value": "En la configuración predeterminada, Apache MyFaces Core versiones 2.2.0 hasta 2.2.13, versiones 2.3.0 hasta 2.3.7, versiones 2.3-next-M1 hasta 2.3-next-M4 y 3.0.0-RC1, usan tokens de tipo cross-site request forgery (CSRF) implícitos y explícitos criptográficamente débiles. Debido a esa limitación, es posible (aunque difícil) para un atacante calcular un valor futuro de token CSRF y usar ese valor para engañar al usuario a ejecutar acciones no deseadas en una aplicación"
    }
  ],
  "lastModified": "2026-06-17T03:43:04.383",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
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              "versionEndIncluding": "2.3.7",
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            },
            {
              "criteria": "cpe:2.3:a:apache:myfaces:2.3:next-m1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "EF54DDD0-74AA-494B-9F69-C1BA5A208B1F"
            },
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              "vulnerable": true,
              "matchCriteriaId": "6DBA33A5-97A2-45D4-AAAC-AD6A05888656"
            },
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            },
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              "vulnerable": true,
              "matchCriteriaId": "3A377CFB-B073-4B74-9CE9-0D09A08FCFCF"
            },
            {
              "criteria": "cpe:2.3:a:apache:myfaces:3.0.0:rc1:*:*:*:*:*:*",
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              "matchCriteriaId": "7CD2AAA3-C1C0-43B2-BD90-742B0B85CD65"
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    {
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  "sourceIdentifier": "security@apache.org"
}