theme

Flatsome Vulnerabilities

17 known security issues reported for the Flatsome WordPress theme. Most recent disclosed Jul 6, 2026.

1 critical 10 medium

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Flatsome <= 3.20.5 - Reflected Cross-Site Scripting

medium

The Flatsome theme for WordPress is vulnerable to Reflected Cross-Site Scripting in versions up to, and including, 3.20.5 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick...

CVSS:
6.1
Affected:
up to 3.20.5
Fix:
No patched version reported
Disclosed:
Jul 6, 2026

CVE-2026-57728 on NVD →

Flatsome <= 3.20.5 - Missing Authorization

medium

The Flatsome theme for WordPress is vulnerable to unauthorized access due to a missing capability check on a function in versions up to, and including, 3.20.5. This makes it possible for unauthenticated attackers to perform an unauthorized action.

CVSS:
5.3
Affected:
up to 3.20.5
Fix:
No patched version reported
Disclosed:
Jul 6, 2026

CVE-2026-57729 on NVD →

Flatsome <= 3.20.5 - Missing Authorization

medium

The Flatsome theme for WordPress is vulnerable to unauthorized access due to a missing capability check on a function in versions up to, and including, 3.20.5. This makes it possible for authenticated attackers, with contributor-level access and above, to perform an unauthorized action.

CVSS:
4.3
Affected:
up to 3.20.5
Fix:
No patched version reported
Disclosed:
Jul 1, 2026

CVE-2026-57731 on NVD →

Flatsome <= 3.20.5 - Missing Authorization

medium

The Flatsome theme for WordPress is vulnerable to unauthorized access due to a missing capability check on a function in versions up to, and including, 3.20.5. This makes it possible for authenticated attackers, with subscriber-level access and above, to perform an unauthorized action.

CVSS:
4.3
Affected:
up to 3.20.5
Fix:
No patched version reported
Disclosed:
Jul 1, 2026

CVE-2026-57730 on NVD →

Flatsome [flatsome] <= 3.20.1 (unfixed)

unknown

[en] Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in UX-themes Flatsome flatsome allows Stored XSS.This issue affects Flatsome: from n/a through <= 3.20.1.

Affected:
up to 3.20.1
Fix:
No patched version reported
Disclosed:
Feb 26, 2026

CVE-2026-28083 on NVD →

Flatsome <= 3.20.5 - Authenticated (Contributor+) Stored Cross-Site Scripting

medium

The Flatsome theme for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 3.20.5 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 wi...

CVSS:
6.4
Affected:
up to 3.20.5
Fixed in:
3.20.6
Disclosed:
Oct 6, 2025

CVE-2026-28083 on NVD →

Flatsome <= 3.20.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode

medium

The Flatsome Theme for WordPress is vulnerable to Stored Cross-Site Scripting via the theme's shortcodes in all versions up to, and including, 3.20.0 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access...

CVSS:
6.4
Affected:
up to 3.20.0
Fixed in:
3.20.1
Disclosed:
Sep 4, 2025

CVE-2025-8684 on NVD →

Flatsome <= 3.19.6 - Missing Authorization

medium

The Flatsome theme for WordPress is vulnerable to unauthorized access due to a missing capability check on a function in versions up to, and including, 3.19.6. This makes it possible for unauthenticated attackers to perform an unauthorized action.

CVSS:
5.3
Affected:
up to 3.19.6
Fixed in:
3.19.7
Disclosed:
Oct 24, 2024

CVE-2026-31915 on NVD →

Flatsome [flatsome] < 3.19.0

unknown

[en] The Flatsome theme for WordPress is vulnerable to Stored Cross-Site Scripting via the UX Countdown, Video Button, UX Video, UX Slider, UX Sidebar, and UX Payment Icons shortcodes in all versions up to, and including, 3.18.7 due to insufficient input sanitization and output escaping on user supplied attributes. Thi...

Affected:
up to 3.19.0
Fixed in:
3.19.0
Disclosed:
Jun 22, 2024

CVE-2024-5346 on NVD →

Flatsome | Multi-Purpose Responsive WooCommerce Theme <= 3.18.7 - Authenticated (Contributor+) Stored Cross-Site Scripting via Multiple Shortcodes

medium

The Flatsome theme for WordPress is vulnerable to Stored Cross-Site Scripting via the UX Countdown, Video Button, UX Video, UX Slider, UX Sidebar, and UX Payment Icons shortcodes in all versions up to, and including, 3.18.7 due to insufficient input sanitization and output escaping on user supplied attributes. This mak...

CVSS:
6.4
Affected:
up to 3.18.7
Fixed in:
3.19.0
Disclosed:
Jun 21, 2024

CVE-2024-5346 on NVD →

Flatsome [flatsome] < 3.19.0

unknown

[en] The Flatsome theme for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's shortcode(s) in all versions up to, and including, 3.18.7 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level...

Affected:
up to 3.19.0
Fixed in:
3.19.0
Disclosed:
Jun 20, 2024

CVE-2024-5156 on NVD →

Flatsome <= 3.18.7 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode

medium

The Flatsome theme for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's shortcode(s) in all versions up to, and including, 3.18.7 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level acce...

CVSS:
6.4
Affected:
up to 3.18.7
Fixed in:
3.19.0
Disclosed:
Jun 19, 2024

CVE-2024-5156 on NVD →

Flatsome [flatsome] < 3.17.6

unknown

[en] Deserialization of Untrusted Data vulnerability in UX-themes Flatsome | Multi-Purpose Responsive WooCommerce Theme.This issue affects Flatsome | Multi-Purpose Responsive WooCommerce Theme: from n/a through 3.17.5.

Affected:
up to 3.17.6
Fixed in:
3.17.6
Disclosed:
Dec 20, 2023

CVE-2023-40555 on NVD →

Flatsome <= 3.17.5 - Unauthenticated PHP Object Injection

critical

The Flatsome theme for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 3.17.5 via deserialization of untrusted input. This allows unauthenticated attackers to inject a PHP Object. If a POP chain is present via an additional plugin or theme installed on the target system, it could allow...

CVSS:
9.8
Affected:
up to 3.17.5
Fixed in:
3.17.6
Disclosed:
Sep 5, 2023

CVE-2023-40555 on NVD →

Flatsome [flatsome] < 3.17.0

unknown

[en] Unauth. Reflected Cross-Site Scripting (XSS) vulnerability in UX-themes Flatsome plugin <= 3.16.8 versions.

Affected:
up to 3.17.0
Fixed in:
3.17.0
Disclosed:
Aug 23, 2023

CVE-2023-28994 on NVD →

Flatsome <= 3.16.8 - Reflected Cross-Site Scripting in UX Builder

medium

The Flatsome theme for WordPress is vulnerable to Reflected Cross-Site Scripting in the UX Builder in versions up to, and including, 3.16.8 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can s...

CVSS:
6.1
Affected:
up to 3.16.8
Fixed in:
3.17.0
Disclosed:
Apr 25, 2023

CVE-2023-28994 on NVD →

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