CVE-2026-16778 json
Live Composer <= 2.1.21 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'dslc_module_downloads_output' Shortcode Content
published 2026-09-22 48 d ago modified 2026-09-22 47 d ago also EUVD-2026-84298
- cvss
- 6.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 32%
- public exploits
- 0
- none known
Summary
The Live Composer – Free WordPress Website Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'dslc_module_downloads_output' Shortcode Content in all versions up to, and including, 2.1.21 due to insufficient input sanitization and output escaping. 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. The save-time wp_kses_post check is bypassed because the payload is stored as a serialized string containing no HTML tags for kses to tokenize, and the shortcode callback re-emits attacker-controlled values — including view_all_link (href attribute), main_heading_title (h2 body), button_text (anchor body), and button_inline_svg (anchor body) — without any escaping at render time.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 48 d ago
Exploit prediction
0.38% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N |
Affected products
- livecomposer Live Composer – Free WordPress Website Builder
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/1d072660-515c-4fd9-903b-815447786e03?source=cve
- plugins.trac.wordpress.org /browser/live-composer-page-builder/tags/2.1.18/modules/downloads/module.php#L5508
- plugins.trac.wordpress.org /browser/live-composer-page-builder/tags/2.1.18/modules/downloads/module.php#L5225
- plugins.trac.wordpress.org /browser/live-composer-page-builder/tags/2.1.18/modules/downloads/module.php#L5219
- plugins.trac.wordpress.org /browser/live-composer-page-builder/tags/2.1.18/modules/downloads/module.php#L5502
- plugins.trac.wordpress.org /browser/live-composer-page-builder/tags/2.1.18/modules/downloads/module.php#L4978
- plugins.trac.wordpress.org /browser/live-composer-page-builder/tags/2.1.18/modules/downloads/module.php#L5685
- plugins.trac.wordpress.org /changeset?reponame=&old=3705127%40live-composer-page-builder&new=3705127%40live-composer-page-builder
Sources
- CVE List CVE-2026-16778
- NVD CVE-2026-16778
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.