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

> Unauthenticated attackers can execute arbitrary scripts in victim browsers via reflected XSS in Advanced Custom Fields plugins.

- **Severity:** High 7.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 10 May 2023
- **Updated:** 28 Apr 2026
- **Also known as:** GHSA-c463-967w-9f3r

## 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 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2023-30777?

It affects 1 product.


Products: 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.

## 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:

- Proof of Concept (PoC) URL generator for a reflected XSS vulnerability in the Advanced Custom Fields WordPress plugin. (github_poc): https://github.com/Alucard0x1/CVE-2023-30777
- Advanced Custom Fields < 6.1.6 - Cross-Site Scripting (nuclei): http/cves/2023/CVE-2023-30777.yaml

## Other vulnerabilities in WP Engine Advanced Custom Fields

- [CVE-2023-1196](https://insights.sbomify.com/CVE-2023-1196/): Advanced Custom Fields - Contributor+ PHP Object Injection (high 8.8)
- [CVE-2022-2594](https://insights.sbomify.com/CVE-2022-2594/): Advanced Custom Fields 5.0-5.12.2 - Unauthenticated File Upload (high 8.8)
- [CVE-2024-4565](https://insights.sbomify.com/CVE-2024-4565/): Advanced Custom Fields < 6.3 - Contributor+ Custom Field Access (high 7.5)
- [CVE-2021-20865](https://insights.sbomify.com/CVE-2021-20865/): Missing authorization in Advanced Custom Fields and Advanced Custom Fields Pro (high 7.5)
- [CVE-2024-9529](https://insights.sbomify.com/CVE-2024-9529/): Secure Custom Fields < 6.3.6.3 - Admin+ Remote Code Execution (medium 6.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-30777 and fix it if it is affected.

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

Affected product: WP Engine Advanced Custom Fields. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2023-30777/ (Markdown: https://insights.sbomify.com/CVE-2023-30777/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-30777
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-30777
- OSV: https://osv.dev/vulnerability/CVE-2023-30777

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-30777/
Summaries are generated and may contain mistakes; the official description above is the record.