CVE-2023-0340: The Custom Content Shortcode WordPress plugin through 4.0.2 does not validate one of its shortcode attribute,

Q: How do I fix CVE-2023-0340?

custom content shortcode: upgrade to newer than 4.0.2. Exact commands for each OS are on this page.

Q: Is CVE-2023-0340 being exploited?

CVE-2023-0340 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-2023-0340 affect?

CVE-2023-0340 affects custom content shortcode. Severity is high (CVSS 8.8). The Custom Content Shortcode WordPress plugin through 4.0.2 does not validate one of its shortcode attribute, which could allow users with a contributor role and above to include arbitrary files via a traversal attack. This could also allow

Q: How urgent is CVE-2023-0340?

Priority 52/100. High severity; Public exploit reference

This month

HIGH 8.8UPGRADE

CVE-2023-0340 is a high-severity flaw (CVSS 8.8) affecting custom content shortcode. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Custom Content Shortcode WordPress plugin through 4.0.2 does not validate one of its shortcode attribute, which could allow users with a contributor role and above to include arbitrary files via a traversal attack. This could also allow them to read non PHP files and retrieve their content. RCE could also be achieved if the attacker manage to upload a malicious image containing PHP code, and then include it via the affected attribute, on a de

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.0% (top 36%)
CISA exploited list	No
Published	2023-03-20
Last modified	2026-06-17

Publisher (CNA): WPScan · Vendor: custom content shortcode project

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

Am I affected?

Timeline

2023-03-20 16:15 UTCPublished CVE record published
2026-06-17 05:25 UTCUpdated Record last modified

custom content shortcode project custom content shortcode UPGRADE

Affected: <= 4.0.2

Fixed in: newer than 4.0.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy custom-content-shortcode || rpm -q custom-content-shortcode || custom-content-shortcode --version

2. UPGRADE to newer than 4.0.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade custom-content-shortcode

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade custom-content-shortcode

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-2023-0340?

custom content shortcode: upgrade to newer than 4.0.2. Exact commands for each OS are on this page.

Is CVE-2023-0340 being exploited?

CVE-2023-0340 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-2023-0340 affect?

CVE-2023-0340 affects custom content shortcode. Severity is high (CVSS 8.8). The Custom Content Shortcode WordPress plugin through 4.0.2 does not validate one of its shortcode attribute, which could allow users with a contributor role and above to include arbitrary files via a traversal attack. This could also allow

How urgent is CVE-2023-0340?

Priority 52/100. High severity; Public exploit reference

Software pages

WordPress vulnerabilities · PHP vulnerabilities

Related CVEs

CVE-2023-0273 MEDIUM 5.4 UPGRADE The Custom Content Shortcode WordPress plugin through 4.0.2 does not validate and escape some of its shortcode

References

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