CVE-2026-9233 — expresstech Vulnerability

What is CVE-2026-9233?

The Quiz and Survey Master (QSM) – Easy Quiz and Survey Maker plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 11.1.4. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with contributor-level access and above, to create, modify, and delete quiz output templates stored in the mlw_quiz_output_templates database table, including storing unsanitized HTML content such as arbitrary script tags.

The record classifies CVE-2026-9233 under weakness class CWE-862. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 100 days ago.

Severity and exploitation probability

CVSS v3.1 base score: 4.3 — MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
EPSS (FIRST): 0.2% probability of exploitation in the next 30 days, higher than 18.9% of all scored CVEs
CISA KEV: Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority: 2.9/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published: 2026-06-27

Is CVE-2026-9233 being exploited?

It currently carries a trending score of 34 in the Threadlinqs vulnerability feed.

Affected products and versions

expresstech: Quiz and Survey Master (QSM) – Easy Quiz and Survey Maker

How to fix CVE-2026-9233

No vendor patch reference has been recorded for CVE-2026-9233 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-9233

No threat campaign in the Threadlinqs corpus currently references CVE-2026-9233, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-06-29. This product uses the NVD API but is not endorsed or certified by the NVD.

Other references

Showing 5 of 12 recorded references.

CVE-2026-9233 — expresstech Quiz and Survey Master (QSM) – Easy Quiz and Survey Maker