CVE-2026-78087
Deferred Deferred - Pending Action

Stored XSS in VK Blocks WordPress Plugin via Group Block LinkToPost

Publication date: 2026-10-15

Last updated on: 2026-10-15

Assigner: Wordfence

Description
The VK Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Group Block 'linkToPost' Feature in all versions up to, and including, 1.126.1 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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-10-15
Last Modified
2026-10-15
Generated
2026-10-19
AI Q&A
2026-10-15
EPSS Evaluated
2026-10-18
NVD
CVE-2026-78087
EUVD
EUVD-2026-101848

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
vektor-inc VK Blocks 0

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

The VK Blocks plugin for WordPress has a stored cross-site scripting vulnerability in the Group Block 'linkToPost' feature. This flaw allows authenticated attackers with contributor-level access or higher to inject malicious scripts into pages. The issue arises from insufficient input sanitization and output escaping.

Detection Guidance

This vulnerability can be detected by checking if the VK Blocks plugin for WordPress is installed and if its version is up to 1.126.1. Review pages or posts for injected scripts in the Group Block 'linkToPost' feature. Use WordPress admin panel to inspect plugin versions and content.

Impact Analysis

This vulnerability allows attackers to inject malicious scripts into WordPress pages. When users access these pages, the scripts execute, potentially stealing session cookies, redirecting users to malicious sites, or performing actions on their behalf. It requires contributor-level access or higher to exploit.

Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR's data protection principles or HIPAA's security requirements. Organizations may face compliance violations if user data is compromised due to this flaw.

Mitigation Strategies

Immediately update the VK Blocks plugin to the latest version beyond 1.126.1. Remove any unauthorized scripts from posts or pages. Restrict contributor-level and higher access to prevent further exploitation. Monitor for unusual activity in WordPress admin areas.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-78087. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart