9.1

CVE-2023-0291: expresstech quiz and survey master Missing Authorization

CVSS: 9.1v3.1CriticalModified
Published 09-06-2023Last modified 08-04-2026
Open JSON

Vulnerability summary

CVE-2023-0291 is a critical (CVSS 9.1) Missing Authorization vulnerability in expresstech quiz and survey master. EPSS estimates a 2.03% chance of exploitation in the next 30 days, higher than 80.8% of scored vulnerabilities. Fixed in 8.0.9.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.1/10
010
Critical · v3.1 (NVD)
EPSS score
2.03%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 09-06-2023
    PublishedVulnerability first disclosed.
  2. 08-04-2026
    Last modifiedVulnerability information updated.

Description

The Quiz And Survey Master for WordPress is vulnerable to authorization bypass due to a missing capability check on the function associated with the qsm_remove_file_fd_question AJAX action in versions up to, and including, 8.0.8. This makes it possible for unauthenticated attackers to delete arbitrary media files.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

2.03%

Chance of exploitation in the next 30 days

Percentile

81%

Versus all other CVEs

30-day change

0.00 pp

From 2.03% on 20-09-2026

20-09-202620-10-2026
EPSS score
2.03%

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≤ 8.0.8 (fixed in 8.0.9)

2 vendors · 3 products

References

5 links