CVE-2026-114624 (GCVE-0-2026-114624)

Vulnerability from cvelistv5 – Published: 2026-10-23 13:47 – Updated: 2026-10-23 13:47
VLAI
Title
baserCMS: PHP object injection via unguarded unserialize() in the widget-area entity
Summary
baserCMS is a website development framework. In versions 5.0.0 before 5.3.2 and 5.4.0 before 5.4.2, the widget-area entity serializes widgets only when the submitted value is an array, allowing a string submitted through the admin JSON API to be stored unchanged. Entity reads, including front-end rendering and API responses, deserialize the stored value with unserialize() without an allowed_classes restriction, accepting both raw and base64-encoded serialized data. An administrator, or an attacker who obtains widget-write capability through a separate vulnerability such as chained XSS, can plant an object graph that subsequently triggers on unauthenticated page requests. Two demonstrated gadget chains in the default dependency set use composer/composer ProcessExecutor::startJob() with Process::fromShellCommandline(), or logiscape/mcp-sdk-php StdioTransport::connect() with StdioServerParameters, to reach proc_open() and execute commands as the web-server user. Deserialization bypasses constructor-based readonly safeguards, and the stored payload can execute repeatedly until the database row is repaired. Unauthenticated page access is a trigger after privileged payload storage, not an unauthenticated means of initially planting the payload. This issue has been patched in versions 5.3.2 and 5.4.2.
Severity
7.2 (High)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-502 - Deserialization of Untrusted Data
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7761 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
baserproject basercms Affected: >= 5.0.0, < 5.3.2
Affected: >= 5.4.0, < 5.4.2
guessed Create a notification for this product.
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "basercms",
          "vendor": "baserproject",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 5.0.0, \u003c 5.3.2"
            },
            {
              "status": "affected",
              "version": "\u003e= 5.4.0, \u003c 5.4.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "baserCMS is a website development framework. In versions 5.0.0 before 5.3.2 and 5.4.0 before 5.4.2, the widget-area entity serializes widgets only when the submitted value is an array, allowing a string submitted through the admin JSON API to be stored unchanged. Entity reads, including front-end rendering and API responses, deserialize the stored value with unserialize() without an allowed_classes restriction, accepting both raw and base64-encoded serialized data. An administrator, or an attacker who obtains widget-write capability through a separate vulnerability such as chained XSS, can plant an object graph that subsequently triggers on unauthenticated page requests. Two demonstrated gadget chains in the default dependency set use composer/composer ProcessExecutor::startJob() with Process::fromShellCommandline(), or logiscape/mcp-sdk-php StdioTransport::connect() with StdioServerParameters, to reach proc_open() and execute commands as the web-server user. Deserialization bypasses constructor-based readonly safeguards, and the stored payload can execute repeatedly until the database row is repaired. Unauthenticated page access is a trigger after privileged payload storage, not an unauthenticated means of initially planting the payload. This issue has been patched in versions 5.3.2 and 5.4.2."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.2,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
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              "description": "CWE-502: Deserialization of Untrusted Data",
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              "type": "CWE"
            }
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-23T13:47:08.832Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/baserproject/basercms/security/advisories/GHSA-xf6p-r2hc-cc6w",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/baserproject/basercms/security/advisories/GHSA-xf6p-r2hc-cc6w"
        },
        {
          "name": "https://github.com/baserproject/basercms/commit/38c778e92688e7f5d620a4c6b47ad7fb9e2c1529",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/baserproject/basercms/commit/38c778e92688e7f5d620a4c6b47ad7fb9e2c1529"
        },
        {
          "name": "https://github.com/baserproject/basercms/commit/59dfe61e193ae3274c195c15e7b185816d2db9db",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/baserproject/basercms/commit/59dfe61e193ae3274c195c15e7b185816d2db9db"
        },
        {
          "name": "https://github.com/baserproject/basercms/releases/tag/5.3.2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/baserproject/basercms/releases/tag/5.3.2"
        },
        {
          "name": "https://github.com/baserproject/basercms/releases/tag/5.4.2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/baserproject/basercms/releases/tag/5.4.2"
        }
      ],
      "source": {
        "advisory": "GHSA-xf6p-r2hc-cc6w",
        "discovery": "UNKNOWN"
      },
      "title": "baserCMS: PHP object injection via unguarded unserialize() in the widget-area entity"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-114624",
    "datePublished": "2026-10-23T13:47:08.832Z",
    "dateReserved": "2026-10-21T20:34:25.600Z",
    "dateUpdated": "2026-10-23T13:47:08.832Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-114624",
      "date": "2026-10-24",
      "epss": "0.00922",
      "percentile": "0.60016"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "basercms",
                "vendor": "baserproject",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003e= 5.0.0, \u003c 5.3.2"
                  },
                  {
                    "status": "affected",
                    "version": "\u003e= 5.4.0, \u003c 5.4.2"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "baserCMS is a website development framework. In versions 5.0.0 before 5.3.2 and 5.4.0 before 5.4.2, the widget-area entity serializes widgets only when the submitted value is an array, allowing a string submitted through the admin JSON API to be stored unchanged. Entity reads, including front-end rendering and API responses, deserialize the stored value with unserialize() without an allowed_classes restriction, accepting both raw and base64-encoded serialized data. An administrator, or an attacker who obtains widget-write capability through a separate vulnerability such as chained XSS, can plant an object graph that subsequently triggers on unauthenticated page requests. Two demonstrated gadget chains in the default dependency set use composer/composer ProcessExecutor::startJob() with Process::fromShellCommandline(), or logiscape/mcp-sdk-php StdioTransport::connect() with StdioServerParameters, to reach proc_open() and execute commands as the web-server user. Deserialization bypasses constructor-based readonly safeguards, and the stored payload can execute repeatedly until the database row is repaired. Unauthenticated page access is a trigger after privileged payload storage, not an unauthenticated means of initially planting the payload. This issue has been patched in versions 5.3.2 and 5.4.2."
          }
        ],
        "id": "CVE-2026-114624",
        "lastModified": "2026-10-23T16:28:32.357",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 7.2,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "HIGH",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.2,
              "impactScore": 5.9,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-10-23T14:17:51.583",
        "references": [
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/baserproject/basercms/commit/38c778e92688e7f5d620a4c6b47ad7fb9e2c1529"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/baserproject/basercms/commit/59dfe61e193ae3274c195c15e7b185816d2db9db"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/baserproject/basercms/releases/tag/5.3.2"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/baserproject/basercms/releases/tag/5.4.2"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/baserproject/basercms/security/advisories/GHSA-xf6p-r2hc-cc6w"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Deferred",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-502"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Primary"
          }
        ]
      }
    }
  }
}



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