CVE-2026-1916Network attack vector

Unauthenticated content manipulation via forged unsigned tokens

Published Feb 25, 2026 · Updated Feb 25, 2026

Missing authorization in WPGSI: Spreadsheet Integration 3.8.3 and earlier allows remote attackers to alter WordPress content. The wpgsi_callBackFuncAccept and wpgsi_callBackFuncUpdate REST callbacks accept requests unconditionally, then trust unsigned Base64-encoded user data. Exploitation requires the administrator email and an active integration with remote updates enabled, and permits creation, modification, or deletion of posts and pages.

CVSS severity7.5
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in WPGSI: Spreadsheet Integration 3.8.3 and earlier allows remote attackers to alter WordPress content. The wpgsi_callBackFuncAccept and wpgsi_callBackFuncUpdate REST callbacks accept requests unconditionally, then trust unsigned Base64-encoded user data. Exploitation requires the administrator email and an active integration with remote updates enabled, and permits creation, modification, or deletion of posts and pages.

The record

CVE
CVE-2026-1916
Published
Feb 25, 2026
Updated
Feb 25, 2026
Vendor
javmah
Product
WPGSI: Spreadsheet Integration
Classifications
CWE-862, T1565.001, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=* <=3.8.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

javmah · WPGSI: Spreadsheet Integrationversion=* <=3.8.3

Published CVSS scores

7.5WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1565.001Stored Data Manipulation
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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