CVE-2023-30777 WordPress Advanced Custom Fields / Advanced Custom Fields PRO plugins <= 6.1.5 vulnerable to Cross Site Scripting (XSS)

What is CVE-2023-30777?

CVE-2023-30777 is a high-severity cross-site scripting vulnerability in WP Engine Advanced Custom Fields, published on 10 May 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Unauth. Reflected Cross-Site Scripting (XSS) vulnerability in WP Engine Advanced Custom Fields Pro, WP Engine Advanced Custom Fields plugins <= 6.1.5 versions.

Weakness: CWE-79

Which versions are affected by CVE-2023-30777?

It affects 1 product.

Products include Advancedcustomfields Advanced Custom Fields.

How do I fix CVE-2023-30777?

No fix has been published for CVE-2023-30777 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2023-30777 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-30777 exists.

Public exploit code: 1 Nuclei template and 1 proofs of concept on GitHub.

Other vulnerabilities in WP Engine Advanced Custom Fields

• CVE-2023-1196 Advanced Custom Fields - Contributor+ PHP Object Injection High 8.8
• CVE-2022-2594 Advanced Custom Fields 5.0-5.12.2 - Unauthenticated File Upload High 8.8
• CVE-2024-4565 Advanced Custom Fields < 6.3 - Contributor+ Custom Field Access High 7.5
• CVE-2021-20865 Missing authorization in Advanced Custom Fields and Advanced Custom Fields Pro High 7.5
• CVE-2024-9529 Secure Custom Fields < 6.3.6.3 - Admin+ Remote Code Execution Medium 6.6

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-c463-967w-9f3r.