CVE-2023-30777 — Unauth

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

01What is this vulnerability?

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

02Affected products

Vendor	Product	Versions
WP Engine	Advanced Custom Fields Pro	n/a
WP Engine	Advanced Custom Fields	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-05-10T05:50:04.023Z
• Last modified: 2025-01-09T15:22:00.542Z

09References

• patchstack.com — https://patchstack.com/database/vulnerability/advanced-custom-fields-pro/wordpre…
• patchstack.com — https://patchstack.com/database/vulnerability/advanced-custom-fields/wordpress-a…
• patchstack.com — https://patchstack.com/articles/reflected-xss-in-advanced-custom-fields-plugins-…