FKIE_CVE-2026-1916
Vulnerability from fkie_nvd - Published: 2026-02-25 09:16 - Updated: 2026-04-15 00:35
Severity ?
Summary
The WPGSI: Spreadsheet Integration plugin for WordPress is vulnerable to unauthorized modification and loss of data due to missing capability checks and an insecure authentication mechanism on the `wpgsi_callBackFuncAccept` and `wpgsi_callBackFuncUpdate` REST API functions in all versions up to, and including, 3.8.3. Both REST endpoints use `permission_callback => '__return_true'`, allowing unauthenticated access. The plugin's custom token-based validation relies on a Base64-encoded JSON object containing the user ID and email address, but is not cryptographically signed. This makes it possible for unauthenticated attackers to forge tokens using publicly enumerable information (admin user ID and email) to create, modify, and delete arbitrary WordPress posts and pages, granted they know the administrator's email address and an active integration ID with remote updates enabled.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "The WPGSI: Spreadsheet Integration plugin for WordPress is vulnerable to unauthorized modification and loss of data due to missing capability checks and an insecure authentication mechanism on the `wpgsi_callBackFuncAccept` and `wpgsi_callBackFuncUpdate` REST API functions in all versions up to, and including, 3.8.3. Both REST endpoints use `permission_callback =\u003e \u0027__return_true\u0027`, allowing unauthenticated access. The plugin\u0027s custom token-based validation relies on a Base64-encoded JSON object containing the user ID and email address, but is not cryptographically signed. This makes it possible for unauthenticated attackers to forge tokens using publicly enumerable information (admin user ID and email) to create, modify, and delete arbitrary WordPress posts and pages, granted they know the administrator\u0027s email address and an active integration ID with remote updates enabled."
},
{
"lang": "es",
"value": "El plugin WPGSI: Spreadsheet Integration para WordPress es vulnerable a la modificaci\u00f3n no autorizada y la p\u00e9rdida de datos debido a la falta de comprobaciones de capacidad y un mecanismo de autenticaci\u00f3n inseguro en las funciones de la API REST \u0027wpgsi_callBackFuncAccept\u0027 y \u0027wpgsi_callBackFuncUpdate\u0027 en todas las versiones hasta la 3.8.3, inclusive. Ambos puntos finales REST utilizan \u0027permission_callback =\u0026gt; \u0027__return_true\u0027\u0027, lo que permite el acceso no autenticado. La validaci\u00f3n personalizada basada en tokens del plugin se basa en un objeto JSON codificado en Base64 que contiene el ID de usuario y la direcci\u00f3n de correo electr\u00f3nico, pero no est\u00e1 firmado criptogr\u00e1ficamente. Esto hace posible que atacantes no autenticados forjen tokens utilizando informaci\u00f3n p\u00fablicamente enumerable (ID de usuario administrador y correo electr\u00f3nico) para crear, modificar y eliminar publicaciones y p\u00e1ginas arbitrarias de WordPress, siempre que conozcan la direcci\u00f3n de correo electr\u00f3nico del administrador y un ID de integraci\u00f3n activo con las actualizaciones remotas habilitadas."
}
],
"id": "CVE-2026-1916",
"lastModified": "2026-04-15T00:35:42.020",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "security@wordfence.com",
"type": "Secondary"
}
]
},
"published": "2026-02-25T09:16:14.943",
"references": [
{
"source": "security@wordfence.com",
"url": "https://plugins.trac.wordpress.org/browser/wpgsi/tags/3.8.3/admin/class-wpgsi-update.php#L116"
},
{
"source": "security@wordfence.com",
"url": "https://plugins.trac.wordpress.org/browser/wpgsi/tags/3.8.3/admin/class-wpgsi-update.php#L636"
},
{
"source": "security@wordfence.com",
"url": "https://plugins.trac.wordpress.org/browser/wpgsi/tags/3.8.3/admin/class-wpgsi-update.php#L94"
},
{
"source": "security@wordfence.com",
"url": "https://plugins.trac.wordpress.org/browser/wpgsi/trunk/admin/class-wpgsi-update.php#L116"
},
{
"source": "security@wordfence.com",
"url": "https://plugins.trac.wordpress.org/browser/wpgsi/trunk/admin/class-wpgsi-update.php#L636"
},
{
"source": "security@wordfence.com",
"url": "https://plugins.trac.wordpress.org/browser/wpgsi/trunk/admin/class-wpgsi-update.php#L94"
},
{
"source": "security@wordfence.com",
"url": "https://plugins.trac.wordpress.org/changeset/3461326/wpgsi/trunk/admin/class-wpgsi-update.php"
},
{
"source": "security@wordfence.com",
"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/7598b38b-26b1-4640-9bd7-60613a5f704d?source=cve"
}
],
"sourceIdentifier": "security@wordfence.com",
"vulnStatus": "Deferred",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-862"
}
],
"source": "security@wordfence.com",
"type": "Secondary"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- 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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