CVE-2023-40555

HIGHNVD 8.38.3—

8.3

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.

CVSS v3: 8.3
EG Score: 8.3(medium)
EPSS: 35.3%
KEV: Not listed

Published

December 20, 2023

Last Modified

April 28, 2026

Advisory Details (1)

Auto-updated May 3, 2026

No patch confirmed yet.

generic

PHP Object Injection in WordPress Flatsome Theme - Patchstack

https://patchstack.com/database/vulnerability/flatsome/wordpress-flatsome-theme-3-17-5-unauthenticated-php-object-injection-vulnerability?_s_id=cve

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-502Deserialization of Untrusted Data

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-04 13:11 UTCepss_batch
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2026-06-02 20:12 UTCepss_batch
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2026-06-01 13:51 UTCepss_batch
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2026-05-31 22:30 UTCepss_batch
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2026-05-29 13:43 UTCepss_batch
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2026-05-28 13:44 UTCepss_batch
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2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch

Frequently asked(5)

What is CVE-2023-40555?

CVE-2023-40555 is a high vulnerability published on December 20, 2023. 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.

When was CVE-2023-40555 disclosed?

CVE-2023-40555 was first published in the National Vulnerability Database on December 20, 2023, with the most recent update on April 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2023-40555 actively exploited?

CVE-2023-40555 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 35.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2023-40555?

CVE-2023-40555 has a CVSS v3 base score of 8.3 (NVD).

How do I remediate CVE-2023-40555?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-40555, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2023-40555

📅 Published

🔄 Last Modified

📋 Advisory Details (1)

PHP Object Injection in WordPress Flatsome Theme - Patchstack

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-40555?

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Published

Last Modified

Advisory Details (1)

Frequently asked(5)

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