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7.5

WPGSI: Spreadsheet Integration plugin exposes sensitive data to unauthorized access

CVE-2026-1916
Summary

The WPGSI: Spreadsheet Integration plugin for WordPress allows attackers to modify and delete WordPress content, potentially leading to data loss. This is due to a flawed authentication system and missing security checks in the plugin's REST API. WordPress administrators should update to a patched version of the plugin to prevent unauthorized access to sensitive data.

Original title
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 ...
Original description
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.
nvd CVSS3.1 7.5
Vulnerability type
CWE-862 Missing Authorization
Published: 25 Feb 2026 · Updated: 12 Mar 2026 · First seen: 6 Mar 2026