CVE-2026-1916 json
WPGSI: Spreadsheet Integration <= 3.8.3 - Missing Authorization to Unauthenticated Arbitrary Post Creation and Deletion via Forged Base64 Token
published 2026-02-25 8 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-8630
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 35%
- public exploits
- 0
- none known
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.
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 8 mo ago
Exploit prediction
0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
Affected products
- javmah WPGSI: Spreadsheet Integration
Classification
- Weakness
-
- CWE-862 Missing Authorization
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/7598b38b-26b1-4640-9bd7-60613a5f704d?source=cve
- plugins.trac.wordpress.org /browser/wpgsi/tags/3.8.3/admin/class-wpgsi-update.php#L94
- plugins.trac.wordpress.org /browser/wpgsi/tags/3.8.3/admin/class-wpgsi-update.php#L116
- plugins.trac.wordpress.org /browser/wpgsi/tags/3.8.3/admin/class-wpgsi-update.php#L636
- plugins.trac.wordpress.org /browser/wpgsi/trunk/admin/class-wpgsi-update.php#L94
- plugins.trac.wordpress.org /browser/wpgsi/trunk/admin/class-wpgsi-update.php#L116
- plugins.trac.wordpress.org /browser/wpgsi/trunk/admin/class-wpgsi-update.php#L636
- plugins.trac.wordpress.org /changeset/3461326/wpgsi/trunk/admin/class-wpgsi-update.php
Sources
- CVE List CVE-2026-1916
- NVD CVE-2026-1916
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.