WordPress theme
Flatsome security & vulnerabilities
Unpatched vulnerability in the latest version
At least one vulnerability affects the latest version and no fix has been released. Deactivate the theme or restrict access to the affected feature until the vendor ships a patch.
- Critical1
- High0
- Medium11
- Low0
All Flatsome vulnerabilities
| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium6.4 | Authenticated (Contributor+) DOM-Based Stored Cross-Site Scripting via 'data-text-sec', 'data-title', and 'title' Attributes via Custom HTML Block ≤3.20.12Update to 3.20.13 | CVE-2026-18742 | |
| Medium5.3 | Missing Authorization ≤3.20.5No patch available | CVE-2026-57729 | |
| Medium6.1 | Reflected Cross-Site Scripting ≤3.20.5No patch available | CVE-2026-57728 | |
| Medium4.3 | Missing Authorization ≤3.20.5No patch available | CVE-2026-57731 | |
| Medium4.3 | Missing Authorization ≤3.20.5No patch available | CVE-2026-57730 | |
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting ≤3.20.5Update to 3.20.6 | CVE-2026-28083 | |
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode ≤3.20.0Update to 3.20.1 | CVE-2025-8684 | |
| Medium5.3 | Missing Authorization ≤3.19.6Update to 3.19.7 | CVE-2026-31915 | |
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting via Multiple Shortcodes ≤3.18.7Update to 3.19.0 | CVE-2024-5346 | |
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode ≤3.18.7Update to 3.19.0 | CVE-2024-5156 | |
| Critical9.8 | Unauthenticated PHP Object Injection ≤3.17.5Update to 3.17.6 | CVE-2023-40555 | |
| Medium6.1 | Reflected Cross-Site Scripting in UX Builder ≤3.16.8Update to 3.17.0 | CVE-2023-28994 |
- Medium6.4Authenticated (Contributor+) DOM-Based Stored Cross-Site Scripting via 'data-text-sec', 'data-title', and 'title' Attributes via Custom HTML Block
≤3.20.12Update to 3.20.13
- Medium5.3Missing Authorization
≤3.20.5No patch available
- Medium6.1Reflected Cross-Site Scripting
≤3.20.5No patch available
- Medium4.3Missing Authorization
≤3.20.5No patch available
- Medium4.3Missing Authorization
≤3.20.5No patch available
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting
≤3.20.5Update to 3.20.6
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode
≤3.20.0Update to 3.20.1
- Medium5.3Missing Authorization
≤3.19.6Update to 3.19.7
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting via Multiple Shortcodes
≤3.18.7Update to 3.19.0
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode
≤3.18.7Update to 3.19.0
- Critical9.8Unauthenticated PHP Object Injection
≤3.17.5Update to 3.17.6
- Medium6.1Reflected Cross-Site Scripting in UX Builder
≤3.16.8Update to 3.17.0
Flatsome: common questions
Does Flatsome have known vulnerabilities?
Yes. VulnCrest Radar lists 12 known vulnerabilities in Flatsome: 1 critical, 11 medium. At least one is not fixed in the latest version.
How do I check which version of Flatsome I run?
In wp-admin open Appearance → Themes and select the theme; the version is shown under the name. Without admin access, our passive Check my site tool can often read it from public files.
What is the most recent Flatsome vulnerability?
CVE-2026-18742, published Nov 13, 2026: Flatsome <= 3.20.12 - Authenticated (Contributor+) DOM-Based Stored Cross-Site Scripting via 'data-text-sec', 'data-title', and 'title' Attributes via Custom HTML Block. Severity: Medium (CVSS 6.4).
Is any Flatsome vulnerability listed in CISA KEV?
No. None of the known Flatsome vulnerabilities is currently listed in the CISA KEV catalog.