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CVE-2026-33386— XSS in QuickCMS

Quick assessment

Affected
OpenSolution QuickCMS
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.

QuickCMS是QuickCMS开源的一款内容管理系统。 QuickCMS存在跨站脚本漏洞，该漏洞源于不安全的基于HTTP的插件获取机制容易受到跨站脚本攻击，恶意攻击者可以通过冒充opensolution.org服务器并在插件列表端点提供任意HTML或JavaScript来执行中间人攻击，当用户访问插件页面时，恶意内容会被自动获取、渲染和执行。

AI Predicted 6.1 Difficulty: Moderate EPSS 0.27% · P18

Affected Version Matrix 1

VendorProduct Version RangeStatus
OpenSolution QuickCMS ≤ 6.8 affected
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I. Basic Information for CVE-2026-33386

Vulnerability Information
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Vulnerability Title
XSS in QuickCMS
Source: CVE Program / CVE List V5
Vulnerability Description
QuickCMS is vulnerable to Cross-Site Scripting (XSS) through its insecure HTTP-based plugin‑fetching mechanism. A malicious attacker can perform a Man‑in‑the‑Middle (MITM) attack by impersonating the opensolution.org server and serving arbitrary HTML or JavaScript at the plugin list endpoint. When a user accesses the plugin page, the malicious content is automatically fetched, rendered, and executed. This issue was fixed in a patch to version 6.8 published on 15.05.2026, deployments without this patch are still vulnerable.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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
Vulnerability Title
QuickCMS 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
QuickCMS是QuickCMS开源的一款内容管理系统。 QuickCMS存在跨站脚本漏洞，该漏洞源于不安全的基于HTTP的插件获取机制容易受到跨站脚本攻击，恶意攻击者可以通过冒充opensolution.org服务器并在插件列表端点提供任意HTML或JavaScript来执行中间人攻击，当用户访问插件页面时，恶意内容会被自动获取、渲染和执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenSolution QuickCMS 0 ~ 6.8 -

II. Public POCs for CVE-2026-33386

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III. Intelligence Information for CVE-2026-33386

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Security Blog Posts for CVE-2026-33386 (1)

Other References for CVE-2026-33386 (1)

IV. Related Vulnerabilities

Same product: QuickCMS
Same vendor: OpenSolution
Same weakness: CWE-79

V. Comments for CVE-2026-33386

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