Missing authorization in javmah WPGSI: Spreadsheet Integration
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-862.
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-1916
- 2026-10-03 Alias added: GHSA-v72r-wpp2-8369
References
Other 8
- https://www.wordfence.com/threat-intel/vulnerabilities/id/7598b38b-26b1-4640-9bd7-60613a5f704d?source=cve
- https://plugins.trac.wordpress.org/browser/wpgsi/tags/3.8.3/admin/class-wpgsi-update.php#L94
- 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/trunk/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/changeset/3461326/wpgsi/trunk/admin/class-wpgsi-update.php
More javmah vulnerabilities
- TI-2024-06112 Missing authorization in javmah WPGSI: Spreadsheet Integration CVSS 3.1MEDIUM 6.3
- TI-2022-04562 Freemius SDK <= 2.4.2 - Missing Authorization Checks CVSS 3.1MEDIUM 6.3
- TI-2024-24716 WordPress Woocommerce Customers Order History plugin <= 5.2.2 - Broken Access Control vulnerability CVSS 3.1MEDIUM 4.3
- TI-2025-01257 Spreadsheet Integration <= 3.8.2 - Cross-Site Request Forgery to Arbitrary Post Publish CVSS 3.1MEDIUM 4.3
Sources
- CVE-2026-1916 · CVE Program
- CVE-2026-1916 · NVD
- FIRST EPSS
- GHSA-v72r-wpp2-8369 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences