FKIE_CVE-2026-27591

Vulnerability from fkie_nvd - Published: 2026-03-11 22:16 - Updated: 2026-03-19 17:37
Severity ?
9.9 (Critical) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Summary
Winter is a free, open-source content management system (CMS) based on the Laravel PHP framework. Prior to 1.0.477, 1.1.12, and 1.2.12, Winter CMS allowed authenticated backend users to escalate their accounts level of access to the system by modifying the roles / permissions assigned to their account through specially crafted requests to the backend while logged in. To actively exploit this security issue, an attacker would need access to the Backend with a user account with any level of access. This vulnerability is fixed in 1.0.477, 1.1.12, and 1.2.12.
References
security-advisories@github.comhttps://github.com/wintercms/winter/security/advisories/GHSA-pgpf-m8m4-6cg6Patch, Vendor Advisory
security-advisories@github.comhttps://wintercms.com/releases/v1.0.477Release Notes
security-advisories@github.comhttps://wintercms.com/releases/v1.1.12Release Notes
security-advisories@github.comhttps://wintercms.com/releases/v1.2.12Release Notes
Impacted products
Vendor Product Version
wintercms winter *
wintercms winter *
wintercms winter *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:wintercms:winter:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "A170C0BF-F88A-484A-A4A4-D87E966EF818",
              "versionEndExcluding": "1.0.477",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:wintercms:winter:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "62491B0E-F94A-4832-B005-BE7F30B61FD4",
              "versionEndExcluding": "1.1.12",
              "versionStartIncluding": "1.1.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:wintercms:winter:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "C5E7A265-618D-4020-A8D9-263759E5EDFA",
              "versionEndExcluding": "1.2.12",
              "versionStartIncluding": "1.2.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Winter is a free, open-source content management system (CMS) based on the Laravel PHP framework. Prior to 1.0.477, 1.1.12, and 1.2.12, Winter CMS allowed authenticated backend users to escalate their accounts level of access to the system by modifying the roles / permissions assigned to their account through specially crafted requests to the backend while logged in. To actively exploit this security issue, an attacker would need access to the Backend with a user account with any level of access. This vulnerability is fixed in 1.0.477, 1.1.12, and 1.2.12."
    },
    {
      "lang": "es",
      "value": "Winter es un sistema de gesti\u00f3n de contenido (CMS) gratuito y de c\u00f3digo abierto basado en el framework PHP Laravel. Antes de las versiones 1.0.477, 1.1.12 y 1.2.12, Winter CMS permit\u00eda a los usuarios autenticados del backend escalar el nivel de acceso de sus cuentas al sistema modificando los roles / permisos asignados a su cuenta a trav\u00e9s de solicitudes especialmente dise\u00f1adas al backend mientras estaban conectados. Para explotar activamente este problema de seguridad, un atacante necesitar\u00eda acceso al Backend con una cuenta de usuario con cualquier nivel de acceso. Esta vulnerabilidad est\u00e1 corregida en las versiones 1.0.477, 1.1.12 y 1.2.12."
    }
  ],
  "id": "CVE-2026-27591",
  "lastModified": "2026-03-19T17:37:17.370",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.9,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.1,
        "impactScore": 6.0,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-03-11T22:16:32.290",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://github.com/wintercms/winter/security/advisories/GHSA-pgpf-m8m4-6cg6"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://wintercms.com/releases/v1.0.477"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://wintercms.com/releases/v1.1.12"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://wintercms.com/releases/v1.2.12"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-284"
        },
        {
          "lang": "en",
          "value": "CWE-639"
        },
        {
          "lang": "en",
          "value": "CWE-915"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}


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Sightings

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  • 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.



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