CVE-2023-40555: Deserialization of Untrusted Data vulnerability in UX-themes Flatsome | Multi-Purpose Responsive WooCommerce T

Q: How do I fix CVE-2023-40555?

flatsome: upgrade to 3.17.6. Exact commands for each OS are on this page.

Q: Is CVE-2023-40555 being exploited?

CVE-2023-40555 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-40555 affect?

CVE-2023-40555 affects flatsome. Severity is high (CVSS 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.

Q: How urgent is CVE-2023-40555?

Priority 46/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 8.3REMOTEUPGRADE

CVE-2023-40555 is a high-severity flaw (CVSS 8.3) affecting flatsome. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.3 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 51%)
CISA exploited list	No
Weakness	CWE-502
Published	2023-12-20
Last modified	2026-06-17

Publisher (CNA): Patchstack · Vendor: uxthemes

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-12-20 14:15 UTCPublished CVE record published
2026-06-17 06:18 UTCUpdated Record last modified

uxthemes flatsome UPGRADE

Affected: < 3.17.6

Fixed in: 3.17.6

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy flatsome || rpm -q flatsome || flatsome --version

2. UPGRADE to 3.17.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade flatsome

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade flatsome

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-40555?

flatsome: upgrade to 3.17.6. Exact commands for each OS are on this page.

Is CVE-2023-40555 being exploited?

CVE-2023-40555 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-40555 affect?

CVE-2023-40555 affects flatsome. Severity is high (CVSS 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.

How urgent is CVE-2023-40555?

Priority 46/100. High severity; Remotely exploitable, no login, no user action

Software pages

WooCommerce vulnerabilities

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References

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