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CVE

CVE-2021-39202

WordPress is a free and open-source content management system written in PHP and paired with a MySQL or MariaDB database

WordPress is a free and open-source content management system written in PHP and paired with a MySQL or MariaDB database. In affected versions the widgets editor introduced in WordPress 5.8 beta 1 has improper handling of HTML input in the Custom HTML feature. This leads to stored XSS in the custom HTML widget.

This has been patched in WordPress 5.8. It was only present during the testing/beta phase of WordPress 5.8.

HIGH · CVSS 7.6 EPSS 0.00817
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
▤

Affected Products & Versions

1
wordpressall versions
▣

Scoring & Timeline

7.6
HIGH · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD09 Sep 2021 · 10:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/WordPress/wordpress-develop/security/advisories/GHSA-fr6h-3855-j297Third Party Advisory
https://hackerone.com/reports/1222797Permissions Required
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