What’s Vulnerable › Vulnerabilities

CVE-2020-35951

• Severity: critical (CVSS 9.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 76.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-01-01 · updated 2026-06-17
• Weakness: CWE-306

Description

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).

Affected products

• ExpressTech Quiz And Survey Master: before 7.0.1 — fixed in 7.0.1

How to fix

Upgrade to a fixed version: ExpressTech Quiz And Survey Master 7.0.1. Check the vendor advisory for mitigations.

References

• https://wpscan.com/vulnerability/10348
• https://www.wordfence.com/blog/2020/08/critical-vulnerabilities-patched-in-quiz-and-survey-master-plugin/
• https://wpscan.com/vulnerability/10348
• https://www.wordfence.com/blog/2020/08/critical-vulnerabilities-patched-in-quiz-and-survey-master-plugin/

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