Page Builder KingComposer <= 2.9.6 - Authenticated Arbitrary Profile Creation and Stored Cross-Site Scripting
Strategic Overview
- Status
- Unpatched
- Affected Version
<= 2.9.6- CVSS
- 8.5High
- Weakness type
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CVE
CVE-2021-25048
At a glance
CVE-2021-25048 is a high-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Page Builder: KingComposer WordPress plugin, affecting versions <= 2.9.6. It carries a CVSS score of 8.5 (reachable over the network; low attack complexity; high integrity impact). Exploitation requires an authenticated account. No fixed release has been reported yet; treat installations running this software as exposed. Disclosed March 2022, reported by Krzysztof Zając.
Vulnerability Overview
The KingComposer WordPress plugin through 2.9.6 does not have authorisation, CSRF and sanitisation/escaping when creating profile, allowing any authenticated users to create arbitrary ones, with Cross-Site Scripting payloads in them
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 interaction from a victim user. A successful exploit has high impact on integrity.
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Reaching this weakness in Page Builder: KingComposer <= 2.9.6 takes any authenticated account. 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. No fixed build of this plugin is recorded for Page Builder: KingComposer yet, so installs running <= 2.9.6 stay exposed until the vendor ships one.
Remediation
No known patch available. Please review the vulnerability's details in depth and employ mitigations based on your organization's risk tolerance. It may be best to uninstall the affected software and find a replacement.
How does WordSec protect against this?
The attempt arrives as an ordinary request to Page Builder: KingComposer: WordSec's web application firewall inspects request payloads before WordPress loads them. No patched version is recorded yet, which is the case where a filtering layer matters most, because there is nothing to update to.
- Firewall
- Alerts
External References
Related records
Same weakness class
Other vulnerabilities in Page Builder: KingComposer – Free Drag and Drop page builder by King-Theme
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