XSS in Brizy Brizy-Page Builder
CVE-2021-38346
The Brizy Page Builder plugin <= 2.3.11 for WordPress allowed authenticated users to upload executable files to a location of their choice using the brizy_create_block_screenshot AJAX action. The file would be named using the id parameter, which could be prepended with "../" to perform directory traversal, and the file contents were populated via the ibsf parameter, which would be base64-decoded and written to the file. While the plugin added a .jpg extension to all uploaded filenames, a double extension attack was still possible, e.g. a file named shell.php would be saved as shell.php.jpg, and would be executable on a number of common configurations.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.017 (76.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 76.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000
Affected products
- Brizy Brizy-Page Builder
- Brizy.io Brizy - Page Builder — versions 2.3.11
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.wordfence.com/blog/2021/10/multiple-vulnerabilities-in-brizy-page-builder-p… (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-38346?
- CVE-2021-38346 is a high-severity vulnerability in Brizy Brizy-Page Builder, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2021-10-14.
- How severe is CVE-2021-38346?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2021-38346 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.