Quick answers
- Is CVE-2026-13203 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-13203 being exploited in the wild.
- How severe is CVE-2026-13203?
- Medium severity, with a CVSS score of 6.4, published 1 September 2026.
- Which products and versions are affected?
- Live Composer Free WordPress Website Builder up to and including 2.1.19.
- Is there a fix for CVE-2026-13203?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-13203 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-13203?
- Check whether you run Live Composer Free WordPress Website Builder at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a Stored Cross-Site Scripting (XSS) flaw in the dslc_modules_section and dslc_modules_area shortcodes. The 'custom_id' attribute is concatenated directly into HTML id="" attributes without using WordPress's esc_attr() function for output escaping. An authenticated attacker with Contributor-level access or above can inject arbitrary JavaScript into the custom_id parameter, which persists in the database and executes in the browsers of all users who view the page. The vulnerability requires authentication but not administrator privileges, making it accessible to lower-privileged users.
Affected products
- Live Composer Free WordPress Website Builder up to and including 2.1.19
Timeline
- 2026-09-01: disclosed