Security readout for executives and security teams
Plain-English summary
A WordPress plugin used to sync spreadsheet data can let outsiders change or delete site content without logging in. The issue affects WPGSI: Spreadsheet Integration up to version 3.8.3. Risk is highest where remote updates are enabled and attacker can learn administrator email and integration details.
Executive priority
Treat as urgent for any public WordPress site using this plugin. The main business risk is unauthorized website content change or deletion, potentially causing reputational harm, defacement, or operational disruption.
Technical view
Two WPGSI REST API callbacks allow unauthenticated access through `permission_callback => __return_true`. The plugin then relies on an unsigned Base64 JSON token containing user ID and email. If required details are known, an unauthenticated attacker can forge authorization and create, modify, or delete arbitrary WordPress posts and pages.
Likely exposure
Public WordPress sites running WPGSI: Spreadsheet Integration version 3.8.3 or earlier are potentially exposed, especially with an active integration ID and remote updates enabled. Sites not using this plugin are not affected based on provided sources.
Exploitation context
No cited source or KEV entry confirms active exploitation. However, the vulnerability is network-accessible, requires no login, and has low attack complexity when prerequisite information is available.
Researcher notes
The CVE maps to CWE-862, missing authorization. Sources identify vulnerable callbacks `wpgsi_callBackFuncAccept` and `wpgsi_callBackFuncUpdate`. The source bundle references a WordPress changeset, but does not clearly name a fixed release version; verify vendor status before closing remediation.
Mitigation direction
- Inventory WordPress sites for WPGSI: Spreadsheet Integration version 3.8.3 or earlier.
- Check vendor and WordPress plugin guidance for an updated fixed release.
- Disable the plugin if no trusted fix is available.
- Disable remote updates or affected integrations where business operations allow.
- Restrict public access to affected REST functionality where feasible.
Validation and detection
- Confirm installed WPGSI plugin version across managed WordPress assets.
- Review whether remote updates are enabled for spreadsheet integrations.
- Check for unexpected post or page creation, modification, or deletion.
- Verify vendor code no longer allows unauthenticated REST callbacks.
- Monitor WordPress and security logs for suspicious unauthenticated REST activity.
Public sources used
- CVE Program
- CVE List V5
- Wordfence vulnerability entry
- WPGSI 3.8.3 source reference line 94
- WPGSI 3.8.3 source reference line 116
- WPGSI 3.8.3 source reference line 636
- WPGSI trunk source reference line 94
- WPGSI trunk source reference line 116
- WPGSI trunk source reference line 636
- WPGSI WordPress changeset 3461326
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-862: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-1916 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/7598b38b-26b1-4640-9bd7-60613a5f704d?source=cveCVE reference
- https://plugins.trac.wordpress.org/browser/wpgsi/tags/3.8.3/admin/class-wpgsi-update.php#L94CVE reference
- https://plugins.trac.wordpress.org/browser/wpgsi/trunk/admin/class-wpgsi-update.php#L94CVE reference
- https://plugins.trac.wordpress.org/changeset/3461326/wpgsi/trunk/admin/class-wpgsi-update.phpCVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Missing Authorization
Missing Authorization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.