What is the CVSS score of CVE-2026-1559?

CVE-2026-1559 has a CVSS 3.1 base score of 6.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Youzify CVE-2026-1559

EUVD-2026-23622 MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-04-18 Wordfence

WordPress XSS Youzify Youzify Buddypress Community User Profile Social Network Membership Plugin For Wordpress Wordpress Plugin

6.4

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

6.4 MEDIUM

AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Apr 18, 2026 - 01:52 vuln.today

EUVD ID Assigned

Apr 18, 2026 - 01:45 euvd

EUVD-2026-23622

Analysis Generated

Apr 18, 2026 - 01:45 vuln.today

CVE Published

Apr 18, 2026 - 01:26 nvd

MEDIUM 6.4

DescriptionCVE.org

The Youzify plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'checkin_place_id' parameter in all versions up to, and including, 1.3.6 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

AnalysisAI

Youzify plugin for WordPress (versions up to 1.3.6) allows authenticated subscribers to execute stored cross-site scripting attacks via the 'checkin_place_id' parameter due to insufficient input sanitization and output escaping. An attacker with subscriber-level access can inject arbitrary JavaScript that executes when other users view the affected page, enabling session hijacking, credential theft, or malware distribution. No public exploit code or active exploitation has been identified at the time of this analysis.

Technical ContextAI

The vulnerability exists in the Youzify WordPress plugin's check-in functionality, specifically in the handling of the 'checkin_place_id' parameter processed by class-youzify-form.php (line 506) and class-youzify-wall.php (line 109). The plugin fails to properly sanitize user input before storing it in the database and does not apply adequate output escaping when rendering the data to the page, creating a stored XSS vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation). This is a post-authentication vulnerability affecting the BuddyPress community and social network integration layer of the plugin. The vulnerability chain involves user-supplied data being accepted without validation, stored persistently, and then rendered without context-appropriate HTML escaping, allowing arbitrary script injection.

RemediationAI

Update Youzify to version 1.3.7 or later, which includes fixes to the 'checkin_place_id' parameter handling with proper input sanitization and output escaping. To apply the patch: navigate to the WordPress admin dashboard, select Plugins, locate Youzify, and click Update if available, or download the latest version from plugins.wordpress.org/plugins/youzify/. Verify the update by checking the plugin version in Installed Plugins (should show 1.3.7+). If immediate patching is not possible, mitigate by restricting subscriber-level access to only trusted users, disabling user registration if not essential, or using a WordPress security plugin (e.g., Wordfence) to implement WAF rules blocking suspicious 'checkin_place_id' payloads. Note that restricting user roles reduces functionality but provides meaningful protection; WAF rules require ongoing maintenance to block new payload patterns. For deployment validation, test the check-in functionality post-update to ensure no regression in social features.