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Media Library Assistant CVE-2026-66600

| EUVDEUVD-2026-63341 CRITICAL
Unrestricted Upload of File with Dangerous Type (CWE-434)
2026-08-20 Patchstack GHSA-684c-ghcx-jgxh
9.1
CVSS 3.1 · Vendor: Patchstack
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Severity by source

Vendor (Patchstack) PRIMARY
9.1 CRITICAL
AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
vuln.today AI
8.8 HIGH

Network-reachable, low-complexity upload reachable by an authenticated Author account justifies PR:L (not PR:H); webshell RCE gives full C/I/A, with scope kept Unchanged absent clear cross-security-authority breakout.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (Patchstack).

CVSS VectorVendor: Patchstack

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Aug 20, 2026 - 12:38 vuln.today
CVE Published
Aug 20, 2026 - 12:07 cve.org
CRITICAL 9.1

DescriptionCVE.org

Author Arbitrary File Upload in Media LIbrary Assistant <= 3.39 versions.

AnalysisAI

Arbitrary file upload in the Media Library Assistant WordPress plugin (versions 3.39 and earlier) lets an authenticated user with Author-level access upload files of dangerous types, typically leading to remote code execution and full site compromise. The flaw was reported by Patchstack and is tracked as CWE-434; no public exploit code has been identified at time of analysis, and it is not listed in CISA KEV. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
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Delivery
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Exploit
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Install
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C2
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Execute
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires an authenticated WordPress account with at least Author-level privileges on a site running Media Library Assistant version 3.39 or earlier - the vulnerability is reached through the plugin's authenticated media/file upload feature, so it cannot be triggered by an anonymous visitor. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The provided CVSS 3.1 vector (AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H, 9.1) signals network-reachable, low-complexity exploitation with full confidentiality, integrity, and availability impact and a scope change consistent with breaking out of the application into the underlying host via a webshell. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade the Media Library Assistant plugin to the version that supersedes 3.39 as soon as the fixed release is confirmed via the Patchstack advisory (https://patchstack.com/database/wordpress/plugin/media-library-assistant/vulnerability/wordpress-media-library-assistant-plugin-3-39-arbitrary-file-upload-vulnerability); the exact patched version number is not stated in the available data, so validate it against the plugin changelog before deploying. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: Audit all users with Author-level access and revoke or restrict unnecessary privileges; enable detailed logging and monitoring of file uploads. …

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CVE-2026-66600 vulnerability details – vuln.today

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