CVE-2026-96558Network attack vectorHinoki check available

Unauthenticated stored XSS via unescaped audit-trail data

Published Oct 10, 2026 · Updated Oct 10, 2026

Stored XSS in Quiz and Survey Master 11.2.6 and earlier allows remote attackers to execute scripts via crafted quiz submissions. The audit-trail failure branch stores unescaped qsm_hidden_questions payloads in wp_mlw_qm_audit_trail.form_data instead of safely handling the submitted data. Exploitation requires an over-length or duplicate qsm_unique_key that makes the mlw_results INSERT fail, followed by a user viewing the injected page; scripts execute in that user's browser.

CVSS severity7.2
High
EPSS probability0.24%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored XSS in Quiz and Survey Master 11.2.6 and earlier allows remote attackers to execute scripts via crafted quiz submissions. The audit-trail failure branch stores unescaped qsm_hidden_questions payloads in wp_mlw_qm_audit_trail.form_data instead of safely handling the submitted data. Exploitation requires an over-length or duplicate qsm_unique_key that makes the mlw_results INSERT fail, followed by a user viewing the injected page; scripts execute in that user's browser.

The record

CVE
CVE-2026-96558
Published
Oct 10, 2026
Updated
Oct 10, 2026
Vendor
ExpressTech Systems
Product
Quiz and Survey Master
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=11.2.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ExpressTech Systems · Quiz and Survey Masterversion=0 <=11.2.6

Published CVSS scores

7.2WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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