Live Composer <= 2.1.18 - Authenticated (Contributor+) PHP Object Injection via Shortcode
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-502.
Summary
The Live Composer – Free WordPress Website Builder plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 2.1.18 via deserialization of untrusted input . This makes it possible for authenticated attackers, with contributor-level access and above, to inject a PHP Object. No known POP chain is present in the vulnerable software, which means this vulnerability has no impact unless another plugin or theme containing a POP chain is installed on the site. If a POP chain is present via an additional plugin or theme installed on the target system, it may allow the attacker to perform actions like delete arbitrary files, retrieve sensitive data, or execute code depending on the POP chain present.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| livecomposer | Live Composer – Free WordPress Website Builder | up to 2.1.18 | — | No fix listed | CNA |
- Live Composer – Free WordPress Website Builder Vendorlivecomposer Affected up to 2.1.18 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-16502
- 2026-10-03 Alias added: GHSA-mmpp-99gg-2rq8
- 2026-10-25 EPSS moved to the 50th–90th percentile
References
Other 8
- https://www.wordfence.com/threat-intel/vulnerabilities/id/1db28477-8982-4e47-b5ed-26fd211ee925?source=cve
- https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.10/modules/downloads/module.php#L5685
- https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.10/modules/downloads/module.php#L4972
- https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.16/modules/downloads/module.php#L4975
- https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.16/modules/downloads/module.php#L4972
- https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.16/modules/downloads/module.php#L5685
- https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.10/modules/downloads/module.php#L4975
- https://plugins.trac.wordpress.org/changeset/3628023/
More livecomposer vulnerabilities
- TI-2025-12857 Deserialization of untrusted data in livecomposer Live Composer – Free WordPress Website… CVSS 3.1HIGH 7.5
- TI-2026-13966 Cross-site scripting in livecomposer Live Composer – Free WordPress Website Builder CVSS 3.1MEDIUM 6.4
- TI-2026-11211 Live Composer <= 2.1.19 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'custom_id' Shortcode Attribute CVSS 3.1MEDIUM 6.4
- TI-2026-13973 Cross-site scripting in livecomposer Live Composer – Free WordPress Website Builder CVSS 3.1MEDIUM 6.4
- TI-2026-13972 Live Composer <= 2.1.19 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'dslc_custom_field' Shortcode CVSS 3.1MEDIUM 6.4
- TI-2026-13971 Cross-site scripting in livecomposer Live Composer – Free WordPress Website Builder CVSS 3.1MEDIUM 6.4
Sources
- CVE-2026-16502 · CVE Program
- CVE-2026-16502 · NVD
- FIRST EPSS
- GHSA-mmpp-99gg-2rq8 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences