{
  "cvss": 8.2,
  "datePublished": "2026-06-25T09:16:46.103",
  "dateUpdated": "2026-10-25T23:10:00.167",
  "description": "When using Apache Shiro with the shiro-guice module in a web servlet context, a specially crafted HTTP request may cause an authentication bypass.\nThis vulnerability is similar to  https://www.cve.org/CVERecord?id=CVE-2020-1957 https://www.cve.org/CVERecord , except that it affects the `shiro-guice` module instead of the `shiro-spring` module.\n\nThis issue affects all Apache Shiro versions through 2.x, and 3.0.0-alpha-1 only when using `shiro-guice` module in a web servlet context.\n\nUpgrade to version 3.0.0 or later, which fixes the issue.",
  "id": "CVE-2026-56091",
  "raw": {
    "affected": [
      {
        "affectedData": [
          {
            "collectionURL": "https://repo.maven.apache.org/maven2",
            "defaultStatus": "unaffected",
            "packageName": "org.apache.shiro:shiro-guice",
            "product": "Apache Shiro",
            "vendor": "Apache Software Foundation",
            "versions": [
              {
                "lessThanOrEqual": "2.99.99",
                "status": "affected",
                "version": "0",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "3.0.0-alpha-1",
                "status": "affected",
                "version": "3.0.0-alpha-0",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "security@apache.org"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "When using Apache Shiro with the shiro-guice module in a web servlet context, a specially crafted HTTP request may cause an authentication bypass.\nThis vulnerability is similar to  https://www.cve.org/CVERecord?id=CVE-2020-1957 https://www.cve.org/CVERecord , except that it affects the `shiro-guice` module instead of the `shiro-spring` module.\n\nThis issue affects all Apache Shiro versions through 2.x, and 3.0.0-alpha-1 only when using `shiro-guice` module in a web servlet context.\n\nUpgrade to version 3.0.0 or later, which fixes the issue."
      },
      {
        "lang": "es",
        "value": "Cuando se usa Apache Shiro con el módulo shiro-guice en un contexto de servlet web, una solicitud HTTP especialmente diseñada puede causar una omisión de autenticación.\nEsta vulnerabilidad es similar a https://www.cve.org/CVERecord?id=CVE-2020-1957 https://www.cve.org/CVERecord, excepto que afecta al módulo ’shiro-guice’ en lugar del módulo ’shiro-spring’.\n\nEste problema afecta a todas las versiones de Apache Shiro hasta la 2.x, y a la 3.0.0-alpha-1 solo cuando se usa el módulo ’shiro-guice’ en un contexto de servlet web.\n\nActualice a la versión 3.0.0 o posterior, que corrige el problema."
      }
    ],
    "id": "CVE-2026-56091",
    "lastModified": "2026-10-25T23:10:00.167",
    "metrics": {
      "cvssMetricV40": [
        {
          "cvssData": {
            "Automatable": "YES",
            "Recovery": "NOT_DEFINED",
            "Safety": "PRESENT",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "availabilityRequirement": "NOT_DEFINED",
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "confidentialityRequirement": "NOT_DEFINED",
            "exploitMaturity": "NOT_DEFINED",
            "integrityRequirement": "NOT_DEFINED",
            "modifiedAttackComplexity": "NOT_DEFINED",
            "modifiedAttackRequirements": "NOT_DEFINED",
            "modifiedAttackVector": "NOT_DEFINED",
            "modifiedPrivilegesRequired": "NOT_DEFINED",
            "modifiedSubAvailabilityImpact": "NOT_DEFINED",
            "modifiedSubConfidentialityImpact": "NOT_DEFINED",
            "modifiedSubIntegrityImpact": "NOT_DEFINED",
            "modifiedUserInteraction": "NOT_DEFINED",
            "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
            "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
            "modifiedVulnIntegrityImpact": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "AMBER",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "DIFFUSE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:P/AU:Y/R:X/V:D/RE:L/U:Amber",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "LOW"
          },
          "source": "security@apache.org",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-56091",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-06-25T12:10:08.791843Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-06-25T09:16:46.103",
    "references": [
      {
        "source": "security@apache.org",
        "url": "https://lists.apache.org/thread/onmtxmy2qonbpx7xlw3o34x8sctv47r7"
      }
    ],
    "sourceIdentifier": "security@apache.org",
    "vulnStatus": "Deferred",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-289"
          }
        ],
        "source": "security@apache.org",
        "type": "Secondary"
      }
    ]
  },
  "severity": "HIGH",
  "source": "nvd",
  "title": "When using Apache Shiro with the shiro-guice module in a web servlet context, a specially crafted HTTP request may ca..."
}