# CVE-2026-4120: Info Cards <= 2.0.7 - Authenticated (Contributor+) Stored Cross-Site Scripting via Block Attributes

> Authenticated attackers can inject JavaScript via block attributes to execute arbitrary scripts in victim browsers.

- **Severity:** Medium 6.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Mar 2026
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-m6j6-gfjm-gh8m

## What is CVE-2026-4120?

CVE-2026-4120 is a medium-severity cross-site scripting vulnerability in bplugins Info Cards – Add Text and Media in Card Layouts, published on 19 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The Info Cards – Add Text and Media in Card Layouts plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'btnUrl' parameter within the Info Cards block in all versions up to, and including, 2.0.7. This is due to insufficient input validation on URL schemes, specifically the lack of javascript: protocol filtering. The block's render.php passes all attributes as JSON to the frontend via a data-attributes HTML attribute using esc_attr(wp_json_encode()), which prevents HTML attribute injection but does not validate URL protocols within the JSON data. The client-side view.js then renders the btnUrl value directly as an href attribute on anchor elements without any protocol sanitization. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject javascript: URLs that execute arbitrary web scripts when a user clicks the rendered button link.

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

## Which versions are affected by CVE-2026-4120?


## How do I fix CVE-2026-4120?

No fix has been published for CVE-2026-4120 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-4120 being exploited?

There is no known exploitation of CVE-2026-4120 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4120 and fix it if it is affected.

What it is: CVE-2026-4120 is a medium-severity cross-site scripting vulnerability in bplugins Info Cards – Add Text and Media in Card Layouts, published on 19 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-4120 in the wild and no public exploit code.

Affected product: bplugins Info Cards – Add Text and Media in Card Layouts. 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-2026-4120/ (Markdown: https://insights.sbomify.com/CVE-2026-4120/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4120
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4120
- OSV: https://osv.dev/vulnerability/CVE-2026-4120

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-4120/
Summaries are generated and may contain mistakes; the official description above is the record.