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CVE-2026-96558— Quiz and Survey Master (QSM) <= 11.2.6 - Unauthenticated Stored DOM-Based Cross-Site Scripting via 'qsm_hidden_questions' Parameter

Quick assessment

Affected
expresstech Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker
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 插件 Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker 在所有 11.2.6 及更早版本中存在存储型 DOM 基于跨站脚本（Stored DOM-Based Cross-Site Scripting）漏洞，原因是未对输入进行充分清理且未在输出时进行转义。该漏洞通过 参数触发，使得未认证的攻击者能够在页面中注入任意 Web 脚本，当用户访问被注入的页面时，脚本将自动执行。 攻击者需通过提交过长或重复的 值，导致 插入操作失败，从而触发

CVSS 7.2 · High EPSS 0.24% · P14

Affected Version Matrix 1

VendorProduct Version RangeStatus
expresstech Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker ≤ 11.2.6 affected
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I. Basic Information for CVE-2026-96558

Vulnerability Information
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Vulnerability Title
Quiz and Survey Master (QSM) <= 11.2.6 - Unauthenticated Stored DOM-Based Cross-Site Scripting via 'qsm_hidden_questions' Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker plugin for WordPress is vulnerable to Stored DOM-Based Cross-Site Scripting via the 'qsm_hidden_questions' parameter in all versions up to, and including, 11.2.6 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This requires the attacker to force the mlw_results INSERT to fail by submitting an over-length or duplicate qsm_unique_key value, which triggers the audit trail code branch that writes the unescaped payload to wp_mlw_qm_audit_trail.form_data.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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
expresstech Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker 0 ~ 11.2.6 -

II. Public POCs for CVE-2026-96558

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III. Intelligence Information for CVE-2026-96558

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Patches & Fixes for CVE-2026-96558 (1)

News Coverage for CVE-2026-96558 (1)

IV. Related Vulnerabilities

Same product: Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker
Same vendor: expresstech
Same weakness: CWE-79

V. Comments for CVE-2026-96558

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