XSS in Noah Kagan Underconstruction
CVE-2021-39320
The underConstruction plugin <= 1.18 for WordPress echoes out the raw value of `$GLOBALS['PHP_SELF']` in the ucOptions.php file. On certain configurations including Apache+modPHP, this makes it possible to use it to perform a reflected Cross-Site Scripting attack by injecting malicious code in the request path.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.023 (82.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 83rd percentile — 82.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.023 · newest: 0.023 · change: 0.000
Affected products
- Noah Kagan Underconstruction — versions 1.18
- Underconstruction Project
Weakness classification (CWE)
Public proof-of-concept exploits
References
- wpscan.com/vulnerability/49ae1df0-d6d2-4cbb-9a9d-bf3599429875 (Third Party Advisory)
- www.wordfence.com/vulnerability-advisories/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-39320?
- CVE-2021-39320 is a medium-severity vulnerability in Noah Kagan Underconstruction, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-09-01.
- How severe is CVE-2021-39320?
- Medium severity. CVSS v3 base score is 6.1 out of 10.
- Is CVE-2021-39320 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.