CVE-2026-74922
Deferred Deferred - Pending Action

Document Gallery Plugin Thumbnail Replacement via Unauthenticated Webhook

Publication date: 2026-10-19

Last updated on: 2026-10-19

Assigner: WPScan

Description
The Document Gallery WordPress plugin through 5.1.1 does not verify the signature on one of its unauthenticated webhook endpoints when no shared secret has been configured, which is the default state, allowing unauthenticated users to replace the thumbnail image the site publishes for any document.

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Meta Information

Published
2026-10-19
Last Modified
2026-10-19
Generated
2026-11-08
AI Q&A
2026-10-19
EPSS Evaluated
2026-11-07
NVD
CVE-2026-74922
EUVD
EUVD-2026-104099

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
Unknown Document Gallery 4.1

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-345 The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.

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Executive Summary

The Document Gallery WordPress plugin up to version 5.1.1 has an unauthenticated webhook endpoint that does not validate signatures when no shared secret is set, which is the default. This allows attackers to replace thumbnail images for any document on the site without authentication.

Detection Guidance

Check if the Document Gallery WordPress plugin version 5.1.1 or below is installed. Inspect webhook endpoints for unauthenticated access without signature verification. Look for unexpected thumbnail image changes on documents.

Impact Analysis

An attacker could replace legitimate document thumbnails with malicious images, potentially misleading users or spreading malware. This could damage trust in the site and affect user experience.

Compliance Impact

This vulnerability could potentially impact compliance with GDPR or HIPAA if the affected WordPress site handles personal or sensitive data. Unauthorized thumbnail replacements might mislead users or obscure accurate document previews, potentially violating data integrity or transparency requirements under these regulations.

Mitigation Strategies

Update the Document Gallery plugin to the latest version. Configure a shared secret for webhook endpoints to enable signature verification. Disable unauthenticated webhook access if not required.

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