CVE-2026-114624
Full vulnerability record from the local CVENow database.
Description
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.
View original CVE JSON
{
"id": "CVE-2026-114624",
"sourceIdentifier": "[email protected]",
"published": "2026-10-23T14:17:51.583",
"lastModified": "2026-10-29T14:17:48.067",
"vulnStatus": "Deferred",
"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."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "baserproject",
"product": "basercms",
"versions": [
{
"version": ">= 5.0.0, < 5.3.2",
"status": "affected"
},
{
"version": ">= 5.4.0, < 5.4.2",
"status": "affected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.2,
"baseSeverity": "HIGH",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "HIGH",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.2,
"impactScore": 5.9
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-10-29T13:36:12.812582Z",
"id": "CVE-2026-114624",
"options": [
{
"exploitation": "poc"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-502"
}
]
}
],
"references": [
{
"url": "https://github.com/baserproject/basercms/commit/38c778e92688e7f5d620a4c6b47ad7fb9e2c1529",
"source": "[email protected]"
},
{
"url": "https://github.com/baserproject/basercms/commit/59dfe61e193ae3274c195c15e7b185816d2db9db",
"source": "[email protected]"
},
{
"url": "https://github.com/baserproject/basercms/releases/tag/5.3.2",
"source": "[email protected]"
},
{
"url": "https://github.com/baserproject/basercms/releases/tag/5.4.2",
"source": "[email protected]"
},
{
"url": "https://github.com/baserproject/basercms/security/advisories/GHSA-xf6p-r2hc-cc6w",
"source": "[email protected]"
},
{
"url": "https://github.com/baserproject/basercms/security/advisories/GHSA-xf6p-r2hc-cc6w",
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
}
]
}