Auth bypass in Expresstech Quiz And Survey Master
CVE-2020-35951
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).
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:H.
EPSS exploit prediction
EPSS: 0.763 (99.5th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.763 · newest: 0.763 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.wordfence.com/blog/2020/08/critical-vulnerabilities-patched-in-quiz-and-sur… (Exploit, Third Party Advisory)
- wpscan.com/vulnerability/10348 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-35951?
- CVE-2020-35951 is a critical-severity vulnerability in Expresstech Quiz And Survey Master, classified under Missing Authentication for Critical Function. CVSS score: 9.9/10. Published 2021-01-01.
- How severe is CVE-2020-35951?
- Critical severity. CVSS v3 base score is 9.9 out of 10.
- Is CVE-2020-35951 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.