CVE-2026-1916WPGSI: Spreadsheet Integration <= 3.8.3 - Missing Authorization to Unauthenticated Arbitrary Post Creation and Deletion via Forged Base64 Token
- 7.5HighCVSS base score
- 0.41%Exploitation in 30 daysEPSS · top 65% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Wordfence
- 21 days later
· 21 days later
Published
- 42 days later
· 42 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| WordfenceCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| NVDNVD · Deferred | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.41% · top 65% of all CVEs (15 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
javmah · WPGSI: Spreadsheet Integration
- affected ≤ 3.8.3
References
References8
- https://www.wordfence.com/threat-intel/vulnerabilities/id/7598b38b-26b1-4640-9bd7-60613a5f704d?source=cve (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/wpgsi/tags/3.8.3/admin/class-wpgsi-update.php#L94 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/wpgsi/tags/3.8.3/admin/class-wpgsi-update.php#L116 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/wpgsi/tags/3.8.3/admin/class-wpgsi-update.php#L636 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/wpgsi/trunk/admin/class-wpgsi-update.php#L94 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/wpgsi/trunk/admin/class-wpgsi-update.php#L116 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/wpgsi/trunk/admin/class-wpgsi-update.php#L636 (opens in a new tab)
- https://plugins.trac.wordpress.org/changeset/3461326/wpgsi/trunk/admin/class-wpgsi-update.php (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-8630 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-1916)Record last updated .