CVE-2021-25067

Landing Page Builder <= 1.4.9.5 - Reflected Cross-Site Scripting

2021-12-16 00:00
Krzysztof Zając

Strategic Overview

Status
Patched in 1.4.9.6
Affected Plugin
Landing Page Builder – Coming Soon page, Maintenance Mode, Lead Page, WordPress Landing Pages
Affected Version
<= 1.4.9.5
CVSS
6.1Medium
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE-2021-25067
View all Landing Page Builder – Coming Soon page, Maintenance Mode, Lead Page, WordPress Landing Pages vulnerabilities

At a glance

CVE-2021-25067 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Landing Page Builder WordPress plugin, affecting versions <= 1.4.9.5. It carries a CVSS score of 6.1 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.4.9.6; sites on affected versions should update now. Disclosed December 2021, reported by Krzysztof Zając.

Vulnerability Overview

The Landing Page Builder WordPress plugin before 1.4.9.6 was affected by a reflected XSS in page-builder-add on the ulpb_post admin page.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site.

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

Reaching this weakness in Landing Page Builder <= 1.4.9.5 takes a caller who can reach the endpoint. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.

Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Landing Page Builder the fix is 1.4.9.6: builds <= 1.4.9.5 are affected, anything from 1.4.9.6 onward is not.

Remediation

Update to version 1.4.9.6, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Landing Page Builder: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Landing Page Builder 1.4.9.6 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-25067https://www.wordfence.com/threat-intel/vulnerabilities/id/9a7cbd2e-79c9-4be7-b458-e4e5f0376a22https://nvd.nist.gov/vuln/detail/CVE-2021-25067

Related records

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