6.4

CVE-2026-11780: expresstech quiz and survey master (qsm) – quiz maker & survey maker Cross-site Scripting

CVSS: 6.4v3.1MediumDeferred
Published 16-08-2026Last modified 18-08-2026
Open JSON

Vulnerability summary

CVE-2026-11780 is a medium (CVSS 6.4) Cross-site Scripting vulnerability in expresstech quiz and survey master (qsm) – quiz maker & survey maker. EPSS estimates a 0.42% chance of exploitation in the next 30 days, higher than 34.8% of scored vulnerabilities. Fixed in 11.2.2.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.4/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.42%
0%100%
Low · +0.12 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 16-08-2026
    PublishedVulnerability first disclosed.
  2. 18-08-2026
    Last modifiedVulnerability information updated.

Description

The Quiz and Survey Master (QSM) – Easy Quiz and Survey Maker plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'question_title' parameter in all versions up to, and including, 11.2.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.42%

Chance of exploitation in the next 30 days

Percentile

35%

Versus all other CVEs

30-day change

+0.12 pp

From 0.30% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.42%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Expresstech1 product
Wordpress1 product
  • quiz-master-next≤ 11.2.1 (fixed in 11.2.2)

2 vendors · 2 products

References

12 links
Show all 12 references