EUVD-2026-34951
GHSA-5m2w-5g87-p5fp
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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ReconObtain or register contributor-level WordPress account
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DeliveryEdit or create page with EmbedPress block
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ExploitInject malicious script in block 'url' attribute
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InstallPublish or save injected page
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C2Victim visits injected page
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ExecuteStored script executes in victim browser
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ImpactSession token or credential exfiltrated
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK
2 techniques across 2 tactics: Initial Access, Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | Exploitation requires a valid WordPress account with contributor-level access or higher on the target site. The attacker must be able to create or edit posts/pages that use the EmbedPress Gutenberg block and set its 'url' attribute to an unsanitized value - this capability is available by default to all WordPress contributor, author, editor, and administrator roles. A victim user (any privilege level, including unauthenticated site visitors) must subsequently load the page containing the injected block for the script to execute. Exploitation is limited by the requirement for prior authenticated access to the WordPress backend; sites that disable open contributor registration, enforce multi-factor authentication on editor accounts, or restrict the post-editing capability to trusted administrators significantly reduce real-world exploitability beyond what the CVSS vector alone conveys. |
| Impact | The CVSS 6.4 Medium score is grounded in a vector of AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N. The most impactful signal here is S:C (Scope Changed), meaning the exploited component (the plugin rendering engine) has downstream impact on a different security domain - victim browsers. PR:L (low privilege required) constrains exploitability to authenticated users with at least contributor access, which is a meaningful barrier on hardened WordPress sites but negligible on multi-author blogs, news sites, or membership platforms where contributor accounts are common or self-registered. Attack complexity is low (AC:L) with no user interaction beyond a victim visiting the injected page (UI:N from attacker perspective, but passive user involvement is the delivery mechanism). No EPSS score was provided in source intelligence, and the vulnerability is not listed in CISA KEV, indicating no confirmed active exploitation at time of analysis. No public POC has been identified. Real-world risk is moderate-to-high for WordPress instances with open contributor registration or untrusted editor accounts, and low for tightly administered single-author sites. |
| Exploit ScenarioDerived | An attacker registers or compromises a WordPress contributor account on a target site, creates or edits a page containing an EmbedPress Gutenberg block, and inserts a malicious JavaScript payload into the block's 'url' attribute. When any authenticated or unauthenticated site visitor loads the injected page, the script executes in their browser, enabling session cookie theft, credential harvesting via fake login overlays, or redirection to attacker-controlled infrastructure. No public POC has been identified, but the vulnerability requires only basic knowledge of the WordPress block editor and JavaScript to exploit manually. |
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Alert meAnalysisAIv1 – Jun 06, 2026
Stored Cross-Site Scripting in the EmbedPress WordPress plugin (all versions through 4.5.3) allows authenticated attackers with contributor-level access to persistently inject arbitrary JavaScript via the block 'url' attribute, executing in the browsers of any user who visits an affected page. The vulnerability originates in insufficient sanitization within EmbedPressBlockRenderer.php and Helper.php, as confirmed by Wordfence and traceable to specific lines in the plugin's source repository. No public exploit code or CISA KEV listing has been identified at time of analysis, but the Scope:Changed CVSS designation reflects that successful exploitation affects resources beyond the vulnerable component itself - namely, victim browser sessions.
RemediationAI
Upstream fix is available per WordPress plugin repository changeset 3546981 (https://plugins.trac.wordpress.org/changeset?reponame=&old=3546981%40embedpress&new=3546981%40embedpress), which modifies the vulnerable rendering code in trunk. Site administrators should update the EmbedPress plugin to the latest available version beyond 4.5.3 via the WordPress admin dashboard or WP-CLI (wp plugin update embedpress); the exact patched release version is not independently confirmed from the available data - verify the installed version exceeds 4.5.3 post-update. As a compensating control pending update, restrict the WordPress contributor role from being assigned to untrusted users and audit existing contributor accounts for unauthorized additions - this limits the attack surface to trusted internal users. Alternatively, temporarily deactivating the EmbedPress plugin eliminates the attack vector entirely at the cost of losing all embed functionality. Content Security Policy (CSP) headers with a restrictive script-src directive can reduce the impact of successful XSS injection but will not prevent the vulnerability from being triggered.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in euvd
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
EmbedPress is a WordPress Gutenberg block plugin developed by WPDevTeam (CPE: cpe:2.3:a:wpdevteam:embedpress_-_pdf_embedder,_embed_pdf_viewer,_youtube_videos,_3d_flipbook,_social_feeds_&_more:*:*:*:*:*:*:*:*) that enables embedding of PDFs, YouTube videos, 3D flipbooks, and social feeds via a 'url' block attribute. The root cause is CWE-79 (Improper Neutralization of Input During Web Page Generation), specifically the failure to sanitize user-supplied input in the 'url' parameter and escape it before rendering in page output. The vulnerable logic is confirmed in EmbedPressBlockRenderer.php (at lines L1181 and L133 across versions 4.4.11 and 4.5.1) and Helper.php (line L1659). These files handle rendering of embed blocks in the Gutenberg editor context, where contributor-level users have edit access by default in most WordPress configurations.
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Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Primary rating from Vendor (Wordfence) · only source for this CVE.
CVSS VectorVendor: Wordfence
DescriptionCVE.org
The EmbedPress - PDF Embedder, Embed PDF viewer, YouTube Videos, 3D FlipBook, Social feeds & more plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the block 'url' attribute in all versions up to, and including, 4.5.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
VulDB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.
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