CVE-2026-1916 Missing authorization in WPGSI: Spreadsheet Integration
Unauthenticated attackers can create, modify, or delete arbitrary posts by forging unsigned Base64 tokens if they know the admin email and an active integration ID.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-1916?
CVE-2026-1916 is a high-severity missing authorization vulnerability in javmah WPGSI: Spreadsheet Integration, published on 25 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-862
Which versions are affected by CVE-2026-1916?
How do I fix CVE-2026-1916?
No fix has been published for CVE-2026-1916 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-1916 being exploited?
There is no known exploitation of CVE-2026-1916 in the wild and no public exploit code.
Sources
Also known as GHSA-v72r-wpp2-8369.