An issue was discovered in the Quiz and Survey Master plugin before 7.0.1 for WordPress.

published 2021-01-01 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-23534

cvss: 9.9; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 76.3%; EPSS 76.3% chance of exploitation in 30 days, percentile 99.5%
public exploits: 0; none known, plus a Nuclei check

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).

Patch / fix

fixed in 1

expresstech quiz_and_survey_master 7.0.1

Exploit prediction

76.33% chance of exploitation in the next 30 days, higher than 99.5% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

Nuclei template Wordpress Quiz and Survey Master <7.0.1 - Arbitrary File Deletion nuclei detection template
wordfence.com https://www.wordfence.com/blog/2020/08/critical-vulnerabilities-patched-in-quiz-and-survey-master-plugin/ referenced PoC, tagged "exploit" by a source, unverified
wpscan.com https://wpscan.com/vulnerability/10348 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	9.9	CVSS:3.1/AC:L/AV:N/A:H/C:L/I:L/PR:N/S:C/UI:N
CNA	3.1	9.9	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:H
NVD	3.1	9.9	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:H
NVD	2.0	6.4	AV:N/AC:L/Au:N/C:N/I:P/A:P

Classification

Weakness

CWE-306 Missing Authentication for Critical Functionality

Technology feeds

WordPress rss critical rss

References

wordfence.com /blog/2020/08/critical-vulnerabilities-patched-in-quiz-and-survey-master-plugin/
exploit, third-party-advisory
wpscan.com /vulnerability/10348
exploit, third-party-advisory

Sources

CVE List CVE-2020-35951
NVD CVE-2020-35951

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary