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.

CVSS v3.1

6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v2.0

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, 82th 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

References

• CVE Record
• NVD entry

Related

• CVE-2021-39316
• CVE-2021-39322
• CVE-2021-39312
• CVE-2021-39327
• CVE-2021-3931
• CVE-2021-39341