VulnCrest
Search
Create account
Report an incident
Radar sectionsDatabase
Check my site
WordPress plugin

Quiz and Survey Master <= 7.0.0 — Unauthenticated Arbitrary File Deletion

CVE-2020-35951Published · Updated

Action summary

Affected: <7.0.1Update to 7.0.1 or newer

All remediation steps
Watch plugin
Severity
High8.2
CVSS
8.2
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
What does this vector mean?
AV:N Attack vector
Network
AC:L Attack complexity
Low
PR:N Privileges required
None
UI:N User interaction
None
S:U Scope
Unchanged
C:N Confidentiality
None
I:L Integrity
Low
A:H Availability
High
Weakness
CWE-639 Authorization Bypass Through User-Controlled Key
Required access
No account needed
Exploit prediction (EPSS)
No score
CISA KEV
Not listed
On this page8

Am I affected?

Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker quiz-master-next

  1. Affected< 7.0.1
  2. Patched in7.0.1

Update to 7.0.1 or newer.

You are affected if you run < 7.0.1. Version 7.0.1 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker.
  • No admin access? Run a passive check of your site. It reads public files only.
  • No account is needed to exploit this. Treat any exposed site on an affected version as at risk.

What to do

  1. Update to version 7.0.1, or a newer patched version
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Chloe Chamberland.

An issue was discovered in the Quiz and Survey Master plugin before 7.0.1 for WordPress. It allows users to delete arbitrary files such as wp-config.php file, which could effectively take a site offline and allow an attacker to reinstall with a WordPress instance under their control. This occurred via qsm_remove_file_fd_question, which allowed unauthenticated deletions (even though it was only intended for a person to delete their own quiz-answer files).

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

More in Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker

All 84
More vulnerabilities in Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker
SeverityVulnerabilityCVEPublished
Medium6.5Authenticated (Contributor+) SQL Injection via 'qpages' Parameter
≤11.2.9Update to 11.3.0
CVE-2026-116509
Medium6.5Unauthenticated Arbitrary Shortcode Execution via 'qsm_unique_key' Parameter
≤11.2.7Update to 11.2.8
CVE-2026-103917
High7.5Authenticated (Contributor+) PHP Object Injection
≤11.2.7Update to 11.2.8
CVE-2026-111408
Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting
≤11.2.7Update to 11.2.8
CVE-2026-107862
High7.2Unauthenticated Stored DOM-Based Cross-Site Scripting via 'qsm_hidden_questions' Parameter
≤11.2.6Update to 11.2.7
CVE-2026-96558

Timeline

  1. CVE published

    Severity high, CVSS 8.2

  2. Record last updated

Sources & licenses

Wordfence record
Vulnerability data
Wordfence Intelligence. [object Object] Licensed under the CC BY-SA 4.0.
CVE® identifiers
[object Object]. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
CVSS / CWE
National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
VulnCrest content
Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.

How we use these sources

Search VulnCrest Radar

Jump to

Are you sure?