# CVE-2026-4512: WP reCaptcha by WebDesignBy < 2.0 – Admin+ Stored XSS

> Administrators on multisite installations can inject arbitrary JavaScript into the login page via the Site Key setting, affecting all visitors.

- **Severity:** Low 3.5 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 23 Apr 2026
- **Updated:** 23 Apr 2026
- **Also known as:** GHSA-gq9g-w427-pc6x

## What is CVE-2026-4512?

CVE-2026-4512 is a low-severity cross-site scripting vulnerability in Unknown reCaptcha by WebDesignBy, published on 23 Apr 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

The reCaptcha by WebDesignBy WordPress plugin before 2.0 does not sanitize or escape the Site Key setting before outputting it in a JavaScript string context via the grecaptcha_js() function. This allows administrators on multisite installations (who do not have the unfiltered_html capability) to inject arbitrary JavaScript that executes for all visitors to the WordPress login page.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-4512?


## How do I fix CVE-2026-4512?

No fix has been published for CVE-2026-4512 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-4512 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4512 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4512 and fix it if it is affected.

What it is: CVE-2026-4512 is a low-severity cross-site scripting vulnerability in Unknown reCaptcha by WebDesignBy, published on 23 Apr 2026. An attacker needs administrator access to exploit it, 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-2026-4512 exists.

Affected product: Unknown reCaptcha by WebDesignBy. 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-2026-4512/ (Markdown: https://insights.sbomify.com/CVE-2026-4512/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4512
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4512
- OSV: https://osv.dev/vulnerability/CVE-2026-4512

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-4512/
Summaries are generated and may contain mistakes; the official description above is the record.