CVE-2021-39320

underConstruction <= 1.18 - Reflected Cross-Site Scripting

MEDIUM 6.1EPSS 2.3%

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.

Affected: Noah Kagan · underConstruction
CVSS v3.1 WORDFENCE: 6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS v2.0 NVD: 4.3 MEDIUMAV:N/AC:M/Au:N/C:N/I:P/A:N
EPSS: 2.32% chance of exploitation in the next 30 days, 83rd percentile
Nuclei: medium · CWE-79
Published: 2021-09-01
Updated: 2025-05-05

Nuclei templates (1)

projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-39320.yaml

Security advisories

https://wpscan.com/vulnerability/49ae1df0-d6d2-4cbb-9a9d-bf3599429875
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39320

References

CVE Record
NVD entry