CVE-2026-78087— VK Blocks <= 1.126.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via Group Block 'linkToPost' Feature
Quick assessment
Affected
vektor-inc VK Blocks
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
WordPress 的 VK Blocks 插件在所有 1.126.1 及更早版本中，存在存储型跨站脚本（XSS）漏洞。该漏洞源于其“Group Block”（组块）功能中的 选项对用户输入缺乏足够的净化处理以及输出时未正确进行转义。因此，拥有贡献者及以上权限的认证攻击者可以在网页中注入任意恶意脚本，当其他用户访问被注入恶意脚本的页面时，这些脚本将自动执行。
Possible ATT&CK Techniques 2 AI
T1189 · Drive-by Compromise T1059 · Command and Scripting InterpreterAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| vektor-inc | VK Blocks | ≤ 1.126.1 |
affected |
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I. Basic Information for CVE-2026-78087
Vulnerability Information
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Vulnerability Title
VK Blocks <= 1.126.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via Group Block 'linkToPost' Feature
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| vektor-inc | VK Blocks | 0 ~ 1.126.1 | - |
|
II. Public POCs for CVE-2026-78087
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Other References for CVE-2026-78087 (2)
IV. Related Vulnerabilities
Same product: VK Blocks
Same vendor: vektor-inc
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V. Comments for CVE-2026-78087
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