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Vulnerability record · CVE-2026-1916 · published 25 February 2026

CVE-2026-1916: Missing authorization vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.36% · top 72.4% CWE-862 · Missing authorization Deferred
7.5CVSS 3.1 base score
0.36%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References

LinkTags
https://plugins.trac.wordpress.org/browser/wpgsi/tags/3.8.3/admin/class-wpgsi-update.php#L116
https://plugins.trac.wordpress.org/browser/wpgsi/tags/3.8.3/admin/class-wpgsi-update.php#L636
https://plugins.trac.wordpress.org/browser/wpgsi/tags/3.8.3/admin/class-wpgsi-update.php#L94
https://plugins.trac.wordpress.org/browser/wpgsi/trunk/admin/class-wpgsi-update.php#L116
https://plugins.trac.wordpress.org/browser/wpgsi/trunk/admin/class-wpgsi-update.php#L636
https://plugins.trac.wordpress.org/browser/wpgsi/trunk/admin/class-wpgsi-update.php#L94
https://plugins.trac.wordpress.org/changeset/3461326/wpgsi/trunk/admin/class-wpgsi-update.php
https://www.wordfence.com/threat-intel/vulnerabilities/id/7598b38b-26b1-4640-9bd7-60613a5f704d?source=cve

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Source: NIST National Vulnerability Database (record CVE-2026-1916), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.