CVE-2023-0538: The Campaign URL Builder WordPress plugin before 1.8.2 does not validate and escape some of its shortcode attr

Q: How do I fix CVE-2023-0538?

campaign url builder: upgrade to 1.8.2. Exact commands for each OS are on this page.

Q: Is CVE-2023-0538 being exploited?

CVE-2023-0538 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-2023-0538 affect?

CVE-2023-0538 affects campaign url builder. Severity is medium (CVSS 5.4). The Campaign URL Builder WordPress plugin before 1.8.2 does not validate and escape some of its shortcode attributes before outputting them back in a page/post where the shortcode is embed, which could allow users with the contributor role

Q: How urgent is CVE-2023-0538?

Priority 34/100. Public exploit reference

Routine

MEDIUM 5.4UPGRADE

CVE-2023-0538 is a medium-severity flaw (CVSS 5.4) affecting campaign url builder. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Campaign URL Builder WordPress plugin before 1.8.2 does not validate and escape some of its shortcode attributes before outputting them back in a page/post where the shortcode is embed, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.4% (top 61%)
CISA exploited list	No
Weakness	CWE-79
Published	2023-03-13
Last modified	2026-06-17

Publisher (CNA): WPScan · Vendor: campaign url builder project

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

Am I affected?

Timeline

2023-03-13 17:15 UTCPublished CVE record published
2026-06-17 05:25 UTCUpdated Record last modified

campaign url builder project campaign url builder UPGRADE

Affected: < 1.8.2

Fixed in: 1.8.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy campaign-url-builder || rpm -q campaign-url-builder || campaign-url-builder --version

2. UPGRADE to 1.8.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade campaign-url-builder

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade campaign-url-builder

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-2023-0538?

campaign url builder: upgrade to 1.8.2. Exact commands for each OS are on this page.

Is CVE-2023-0538 being exploited?

CVE-2023-0538 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-2023-0538 affect?

CVE-2023-0538 affects campaign url builder. Severity is medium (CVSS 5.4). The Campaign URL Builder WordPress plugin before 1.8.2 does not validate and escape some of its shortcode attributes before outputting them back in a page/post where the shortcode is embed, which could allow users with the contributor role

How urgent is CVE-2023-0538?

Priority 34/100. Public exploit reference

Software pages

WordPress vulnerabilities

References

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