CVE-2026-18488
MediumCVSS 6.4Exploitation Probability (EPSS)
Low risk26th percentile - higher than 26% of all known CVEs
Summary
The Blocksy Companion plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'tagName' block attribute in all versions up to and including 2.1.51. Authenticated attackers with author-level access or higher can inject arbitrary web scripts that execute whenever a user accesses an injected page.
Risk Assessment
The risk includes user data theft, account takeover, and malware distribution on the site, potentially harming the organization's reputation.
Recommendation
Update the plugin to the latest patched version. Also, restrict author permissions and regularly audit content for malicious code.
Other vulnerabilities in Blocksy Companion
See all- CVE-2026-97247Medium
Unauthenticated Broken Access Control vulnerability in Blocksy Companion versions up to 2.1.55.
- CVE-2026-107645Critical
The Blocksy Companion plugin up to version 2.1.58 is vulnerable to privilege escalation. The implement_user_registration() AJAX handler disables Dokan's vendor-registration nonce check and trusts an attacker-supplied $_POST['role'] value, allowing unauthenticated attackers to obtain a Dokan 'seller' account and be auto-authenticated, even when vendor signup is disabled.
- CVE-2026-15158Critical
The Blocksy Companion plugin for WordPress is vulnerable to arbitrary file upload in versions up to 2.1.46. The flaw lies in the save_attachments function, which improperly validates file extensions, allowing double-extension files like shell.woff2.php to bypass MIME checks. This can lead to remote code execution, but exploitation requires the premium plugin with specific extensions active.
- CVE-2026-65444Medium
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Creative Themes Blocksy Companion blocksy-companion allows Stored XSS. This issue affects Blocksy Companion: from n/a through 2.1.60.
- CVE-2025-12475Medium
The Blocksy Companion plugin for WordPress (up to 2.1.14) is vulnerable to Stored XSS via the 'blocksy_newsletter_subscribe' shortcode due to insufficient input sanitization and output escaping.
Original NVD description (English source)
The Blocksy Companion plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'tagName' Block Attribute (blocksy/dynamic-data) in all versions up to, and including, 2.1.51 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS