CVE-2026-5797Network attack vector

Unauthenticated quiz-result access via shortcode execution

Published Apr 17, 2026 · Updated Apr 17, 2026

Shortcode injection in ExpressTech Systems Quiz and Survey Master 11.1.0 and earlier allows remote attackers to execute registered shortcodes. Quiz answer text retains shortcode brackets after sanitize_text_field() and htmlspecialchars(), and do_shortcode() then evaluates the rendered results page containing those answers. No authentication is required to submit the answer, and the unprotected qsm_result shortcode can return another user's submission.

CVSS severity5.3
Medium
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Shortcode injection in ExpressTech Systems Quiz and Survey Master 11.1.0 and earlier allows remote attackers to execute registered shortcodes. Quiz answer text retains shortcode brackets after sanitize_text_field() and htmlspecialchars(), and do_shortcode() then evaluates the rendered results page containing those answers. No authentication is required to submit the answer, and the unprotected qsm_result shortcode can return another user's submission.

The record

CVE
CVE-2026-5797
Published
Apr 17, 2026
Updated
Apr 17, 2026
Vendor
ExpressTech Systems
Product
Quiz and Survey Master
Classifications
CWE-74, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 17, 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 <=10.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ExpressTech Systems · Quiz and Survey Masterversion=0 <=10.1.0

Published CVSS scores

5.3WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
T1190Exploit Public-Facing Application

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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