The Photo Gallery, Sliders, Proofing and Themes – NextGEN Gallery plugin for WordPress is vulnerable to Insecure Direct Object Reference in versions up to and including 4.2.0. This is due to insufficient object-level authorization in the image deletion REST flow where the permission callback for DELETE /imagely/v1/images/{id} only checks 'NextGEN Manage gallery' permissions and does not enforce gallery ownership or 'NextGEN Manage others gallery' permissions. This makes it possible for authenticated attackers, with Subscriber-level privileges and 'NextGEN Manage gallery' capability, to delete gallery images belonging to other users as well as their associated image files from disk when deleteImg is enabled (default).
CVE-2026-6566 is a medium severity with CVSS 4.3 Authorization Bypass issue affecting the Plugin Photo Gallery, Sliders, Proofing and Themes – NextGEN Gallery. It affects Versions up to 4.2.0 and is fixed in 4.2.1.
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Open the grouped hub for related CVEs, affected ranges, severity mix, and patch coverage.
Check access, XML-RPC exposure, backup readiness, and monitoring after patching.
Use containment, evidence capture, remediation, and validation steps when exploit risk is high.
CVE-2026-6566 is tracked for the Plugin Photo Gallery, Sliders, Proofing and Themes – NextGEN Gallery as medium severity with CVSS 4.3. The affected range is Versions up to 4.2.0. Update Photo Gallery, Sliders, Proofing and Themes – NextGEN Gallery to 4.2.1 or newer where that version is compatible with the site.
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Affected version data gives operators a concrete comparison point against installed WordPress software.
A fixed version is present, so the page can answer update and remediation intent directly.
External references are available for source validation, advisory review, and incident notes.
Use these checks when converting this record into a patch ticket, incident note, or risk acceptance decision.
Inventory the installed Plugin package and compare its version with Versions up to 4.2.0.
Confirm Photo Gallery, Sliders, Proofing and Themes – NextGEN Gallery is updated to 4.2.1 or newer.
Review references and CVSS vector details for exploitability, authentication requirements, and exposure path.
After patching, re-run vulnerability monitoring and keep the related plugin or theme hub under review for follow-up CVEs.
| Software Type | Plugin |
|---|---|
| Software Slug |
nextgen-gallery
View on wordpress.org
|
| CVE | CVE-2026-6566 |
| Patched Versions |
4.2.1
|
| Affected Versions |
Versions up to 4.2.0
|
These internal links group the same WordPress plugin by CVE, issue type, severity, and patch status so operators and search engines can connect the full vulnerability cluster.
NextGEN Gallery <= 3.2.10 - SQL Injection
NextGEN Gallery <= 2.1.56 - Authenticated Local File Inclusion & SQL injection
WordPress Gallery Plugin – NextGEN Gallery <= 1.9.12 - Arbitrary File Upload
Photo Gallery, Sliders, Proofing and Themes – NextGEN Gallery <= 4.0.4 - Authenticated (Author+) Local File Inclusion
Photo Gallery, Sliders, Proofing and Themes – NextGEN Gallery <= 3.59.12 - Authenticated (Contributor+) Local File Inclusion via 'template'
WordPress Gallery Plugin – NextGEN Gallery <= 3.4.7 - Cross-Site Request Forgery to Arbitrary File Upload
WordPress Gallery Plugin – NextGEN Gallery <= 3.4.7 - Cross-Site Request Forgery
NextGen Gallery <= 2.1.10 - Unrestricted File Upload
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