6.4

CVE-2021-36863: expresstech quiz and survey master Cross-site Scripting

CVSS: 6.4v3.1MediumModified
Published 28-10-2022Last modified 28-04-2026
Open JSON

Vulnerability summary

CVE-2021-36863 is a medium (CVSS 6.4) Cross-site Scripting vulnerability in expresstech quiz and survey master. EPSS estimates a 0.50% chance of exploitation in the next 30 days, higher than 41.1% of scored vulnerabilities. Fixed in 7.3.5.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.4/10
010
Medium · v3.1 (wordfence)
EPSS score
0.50%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 28-10-2022
    PublishedVulnerability first disclosed.
  2. 28-04-2026
    Last modifiedVulnerability information updated.

Description

Auth. (contributor+) Stored Cross-Site Scripting (XSS) vulnerability in ExpressTech Quiz And Survey Master plugin <= 7.3.4 on WordPress.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.50%

Chance of exploitation in the next 30 days

Percentile

41%

Versus all other CVEs

30-day change

+0.02 pp

From 0.48% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.50%

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

Expresstech2 products
Wordpress1 product
  • quiz-master-next≤ 7.3.4 (fixed in 7.3.5)

2 vendors · 3 products

References

3 links