Medium 5.3Published Apr 17, 2026

CVE-2026-5797Quiz and Survey Master (QSM) <= 11.1.0 - Unauthenticated Shortcode Injection Leading to Arbitrary Quiz Result Disclosure via Quiz Answer Text Input Fields

Updated under an hour ago (Oct 26, 2026, 2:20 PM ET)

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It affects expresstech Quiz and Survey Master (QSM) – Easy Quiz and Survey Maker. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for expresstech Quiz and Survey Master (QSM) – Easy Quiz and Survey Maker

Exploited in the last 30 days

The Quiz And Survey Master plugin for WordPress is vulnerable to Arbitrary Shortcode Execution in versions up to and including 11.1.0. This is due to insufficient input sanitization and the execution of do_shortcode() on user-submitted quiz answer text. User-submitted answers pass through sanitize_text_field() and htmlspecialchars(), which only strip HTML tags but do not encode or remove shortcode brackets [ and ]. When quiz results are displayed, the plugin calls do_shortcode() on the entire results page output (including user answers), causing any injected shortcodes to be executed. This makes it possible for unauthenticated attackers to inject arbitrary WordPress shortcodes such as [qsm_result id=X] to access other users' quiz submissions without authorization, as the qsm_result shortcode lacks any authorization checks.

CVSS: 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness (CWE): CWE-74
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Wordfence
NVD analysis: Deferred
Record last updated: Apr 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

expresstech Quiz and Survey Master (QSM) – Easy Quiz and Survey Maker expresstech:quiz_and_survey_master_qsm_easy_quiz_and_survey_maker (from the name)	through 10.1.0	CNA record

References

References

https://www.wordfence.com/threat-intel/vulnerabilities/id/f2aa33cc-c1c4-42d4-9c2f-54648426ee4b?source=cve
https://plugins.trac.wordpress.org/browser/quiz-master-next/trunk/php/classes/class-qsm-results-pages.php#L193
https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/10.3.5/php/classes/class-qsm-results-pages.php#L193
https://plugins.trac.wordpress.org/browser/quiz-master-next/trunk/php/classes/class-qmn-quiz-manager.php#L572
https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/10.3.5/php/classes/class-qmn-quiz-manager.php#L572
https://plugins.trac.wordpress.org/browser/quiz-master-next/trunk/php/classes/question-types/class-question-review-text.php#L15
https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/10.3.5/php/classes/question-types/class-question-review-text.php#L15
https://plugins.trac.wordpress.org/browser/quiz-master-next/trunk/php/classes/question-types/class-question-review.php#L40
https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/10.3.5/php/classes/question-types/class-question-review.php#L40
https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3506094%40quiz-master-next&new=3506094%40quiz-master-next&sfp_email=&sfph_mail=

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.