WordPress
CVE-2026-1916
HIGH
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Unauthenticated attackers can forge authentication tokens in the WPGSI: Spreadsheet Integration plugin for WordPress (versions up to 3.8.3) due to missing capability checks and weak token validation that relies only on Base64-encoded, unsigned user data. This allows remote attackers to create, modify, and delete arbitrary WordPress posts and pages without authentication. No patch is currently available.
Technical ContextAI
Classified as CWE-862 (Missing Authorization). 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
Affected ProductsAI
The WPGSI: Spreadsheet Integration plugin for WordPress is vulnerable to unauthorized modification and loss of data due to missing capability checks a
RemediationAI
Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.
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Same weakness CWE-862 – Missing Authorization
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External POC / Exploit Code
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