EUVD-2026-72402
GHSA-c2fp-562c-5p2q
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessSend crafted HTTP request to plugin endpoint
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DeliveryInject arbitrary shortcode in subscriber-controlled field
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ExploitPlugin passes value to do_shortcode() without validation
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ExecutionWordPress evaluates shortcode against site registry
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PersistExecute shortcode with web-server privileges
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ImpactExfiltrate data or achieve code execution
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Code injection prevention, sandbox exec
MITRE ATT&CK
2 techniques across 2 tactics: Execution, Initial Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | No authentication is required - the CVSS vector confirms PR:N and UI:N, meaning any network-reachable attacker against the default plugin configuration can attempt exploitation. The critical limiting factor is the WordPress shortcode registry: the actual impact depends entirely on which shortcodes are registered on the target site beyond WordPress core. Sites running only standard or presentational shortcodes face low impact (C:L/I:L). Sites with developer tools, import/export plugins, or custom function shortcodes registered are at risk of code execution. The vulnerability is triggered through plugin-exposed subscription or email workflow actions (identified in class-es-handle-subscription.php and class-es-action-send-email.php), which must be reachable via HTTP - typical on any public-facing WordPress installation using this plugin. |
| Impact | The CVSS 3.1 base score of 6.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N) reflects low-complexity, unauthenticated, remote exploitation with bounded confidentiality and integrity impact under scope-unchanged conditions. The 'RCE' tag in the input is aspirational: arbitrary shortcode execution can escalate to code execution only when a code-execution shortcode (e.g., from a code-runner or custom-function plugin) is registered on the target site - this is plausible but not guaranteed on default WordPress installs. Real-world risk is therefore highly site-specific: sites running only standard shortcodes face limited impact (data leakage, minor content manipulation), while sites with developer or automation plugins are materially more exposed. No EPSS score or KEV listing is included in the input, and no public exploit code has been identified, which moderates urgency relative to the raw CVSS. The broad affected version range (all versions through 5.9.27) and the plugin's large WordPress install base do make this a meaningful mass-exposure risk worth patching promptly. |
| Exploit ScenarioDerived | An unauthenticated attacker submits a crafted HTTP request to the WordPress AJAX or form endpoint exposed by the Email Subscribers plugin, embedding a malicious shortcode - such as one that reads environment variables or invokes a file-inclusion function - as a subscriber-controlled field value. The plugin passes this value directly to |
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Alert meAnalysisAIv1 – Sep 07, 2026
Arbitrary shortcode execution in the Icegram Email Subscribers & Newsletters WordPress plugin (all versions through 5.9.27) allows unauthenticated network attackers to invoke registered WordPress shortcodes without authentication. The flaw originates in the plugin's email workflow and subscription handling code, which passes user-controlled input to do_shortcode() without adequate validation - enabling attackers to trigger any shortcode registered on the target site. Depending on the shortcodes available, impact ranges from information disclosure and content manipulation to potential code execution; no public exploit or CISA KEV listing has been identified at time of analysis.
RemediationAI
The primary remediation is to update the Email Subscribers & Newsletters plugin to a version beyond 5.9.27 as soon as the vendor releases a patched build; no specific fixed version number is confirmed in the available data, so monitor the official WordPress plugin repository and the Wordfence advisory at https://www.wordfence.com/threat-intel/vulnerabilities/id/6d9b4448-2b63-4704-ac9e-c4db4784638c for the confirmed patch release. As an interim compensating control, site administrators should restrict public access to the WordPress REST API and AJAX endpoints that process email subscription and workflow actions - specifically reviewing any publicly accessible form submission handlers tied to the Email Subscribers plugin - using a WAF rule or network-level control, noting this may disrupt legitimate subscription forms. Auditing which shortcodes are registered on the site and disabling any that expose privileged operations (e.g., code-runner or import shortcodes) reduces the blast radius of exploitation until a patch is applied.
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
The vulnerability resides in multiple plugin classes, specifically identified in source references at class-es-action-send-email.php (L188), class-es-mailer.php (L1133), and class-es-handle-subscription.php (L165, L260) across plugin versions 5.9.22 and 5.9.26. These files implement email-sending workflows and subscription lifecycle actions. The root cause (CWE-94, Improper Control of Code Generation) is that user-supplied values are passed to WordPress's do_shortcode() API - a function that evaluates all registered shortcode tags - without prior sanitization or allowlisting. Because WordPress shortcode execution is extensible across all installed plugins and themes, the attack surface is site-dependent: plugins like WooCommerce, Gravity Forms, or WP All Import register shortcodes that can expose sensitive data or trigger privileged operations when invoked by unauthenticated callers. The CPE cpe:2.3:a:icegram:email_subscribers_&_newsletters_... confirms the affected vendor as Icegram.
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Unauthenticated network exploitation with no interaction; impact bounded to low C/I because actual harm depends on site-specific registered shortcodes.
Primary rating from Vendor (Wordfence).
CVSS VectorVendor: Wordfence
DescriptionCVE.org
The The Email Subscribers & Newsletters - Email Marketing, Post Notifications & Newsletter Plugin for WordPress plugin for WordPress is vulnerable to arbitrary shortcode execution in all versions up to, and including, 5.9.27. This is due to the software allowing users to execute an action that does not properly validate a value before running do_shortcode. This makes it possible for unauthenticated attackers to execute arbitrary shortcodes.
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
Code injection occurs when an application accepts user input and passes it directly into a language interpreter or evaluator without proper sanitization.
Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.
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