XSS in Themeum Wp Page Builder
CVE-2021-24208
The editor of the WP Page Builder WordPress plugin before 1.2.4 allows lower-privileged users to insert unfiltered HTML, including JavaScript, into pages via the “Raw HTML” widget and the “Custom HTML” widgets (though the custom HTML widget requires sending a crafted request - it appears that this widget uses some form of client side validation but not server side validation), all of which are added via the “page_builder_data” parameter when performing the “wppb_page_save” AJAX action. It is also possible to insert malicious JavaScript via the “wppb_page_css” parameter (this can be done by closing out the style tag and opening a script tag) when performing the “wppb_page_save” AJAX action.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.007 (49.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Themeum Wp Page Builder
- Wp Page Builder — versions 1.2.4
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.themeum.com/wp-page-builder-updated-v1-2-4/ (Patch, Vendor Advisory)
- wpscan.com/vulnerability/c20e243d-b0de-4ae5-9a0d-b9d02c9b8141 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-24208?
- CVE-2021-24208 is a medium-severity vulnerability in Themeum Wp Page Builder, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-04-05.
- How severe is CVE-2021-24208?
- Medium severity. CVSS v3 base score is 5.4 out of 10.
- Is CVE-2021-24208 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.