Live Composer: Stored Cross-Site Scripting via page-builder shortcode
Summary
The Live Composer WordPress plugin before 2.1.24 does not escape several attributes of one of its page-builder shortcodes before outputting them in HTML tag attributes. An attacker with a Contributor account or higher can store a payload that runs in the browser of anyone who views the post. An administrator reviewing a pending submission can also be affected, so the attacker may be able to act with administrator rights. The victim must view the affected content.
Affected
- Live Composer WordPress plugin, versions 0 to before 2.1.24 (CNA data)
- Attacker requires a Contributor account or higher
Fixed in
- Live Composer 2.1.24 (first fixed version according to CNA data)
Workaround
- Not needed once 2.1.24 or later is installed.
- Until patched: restrict or remove untrusted Contributor accounts, remove malicious shortcode content from existing posts, and invalidate privileged sessions if affected pages were viewed. These measures come from related Live Composer advisories and have not been verified for this CVE.
Exploitation
- Not listed in CISA KEV.
- OffSeq: not known to be exploited.
- No public proof of concept found in the indexes checked.
- CISA SSVC: exploitation none, automatable no, technical impact total.
Our recommendation
- Inventory Live Composer installations and check the version. Anything below 2.1.24 is affected.
- Update to 2.1.24 or later after confirming the fix in the WordPress.org changelog.
- Review Contributor and Author accounts and remove unused ones.
- Check pending posts and existing content for shortcode attributes containing script or HTML.
- Where practical, administrators should avoid previewing untrusted submissions while logged in.
- Recheck NVD and the WPScan advisory, since the CVSS vector is still under review (the description suggests PR:L rather than PR:H).
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- WPScan vulnerability advisory wpscan.com
- CVE Record CVE-2026-119531 www.cve.org
- VulDB CVE-2026-119531 vuldb.com
- OpenCVE CVE-2026-119531 app.opencve.io
- OffSeq threat radar CVE-2026-119531 radar.offseq.com
- WPScan plugin page Live Composer wpscan.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 11 Nov 2026, 13:33.
Original description (NVD)
The Live Composer WordPress plugin before 2.1.24 does not escape several attributes of one of its page-builder shortcodes before outputting them inside HTML tag attributes, allowing users with the Contributor role and above to store a payload that executes in the browser of anyone who views the post, including an administrator reviewing the pending submission.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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