CVE-2026-13203: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in livecomposer Live Composer – Free WordPress Website Builder
Description
The Live Composer – Free WordPress Website Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'custom_id' shortcode attribute of the dslc_modules_section and dslc_modules_area shortcodes in versions up to, and including, 2.1.19. This is due to insufficient input sanitization and output escaping on the user-supplied attribute, which is concatenated into the HTML id="" attribute of the rendered <div> element in the dslc_modules_section_front() and dslc_modules_area_front() functions without esc_attr(). This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
CVSS v3.1
Score 6.4medium
Affected software
livecomposer
Live Composer – Free WordPress Website Builder
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Live Composer plugin for WordPress suffers from a stored XSS vulnerability in versions up to 2.1.19. The flaw arises because the 'custom_id' attribute of certain shortcodes is concatenated directly into an HTML id attribute without proper escaping (missing esc_attr()), allowing injection of malicious scripts. This vulnerability requires authenticated access at Contributor level or above, enabling attackers to inject scripts that execute in the context of users visiting the compromised pages.
Potential Impact
An attacker with Contributor-level or higher privileges can inject malicious JavaScript code into pages via the vulnerable shortcode attribute. This code executes in the browsers of users who view the infected pages, potentially leading to session hijacking, privilege escalation, or other client-side attacks. The vulnerability does not affect availability but impacts confidentiality and integrity of user sessions and data.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict Contributor-level access to trusted users only and consider disabling or limiting use of the affected shortcodes. Monitor official Live Composer channels for updates and apply any released patches promptly.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-06-24T14:06:30.279Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a9656a2acd9273b4936dc55
Added to database: 09/01/2026, 04:37:54 UTC
Last enriched: 09/07/2026, 15:06:09 UTC
Last updated: 10/14/2026, 06:48:16 UTC
Views: 55
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.