# CVE-2026-2951: Cross-site scripting in Gutentor – Gutenberg Blocks – Page Builder for Gutenberg Editor

> Authenticated contributors can inject arbitrary scripts into pages via the Gutentor plugin, leading to code execution when other users view the page.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/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:** A user has to click or open something
- **Fix available:** No
- **Published:** 23 Apr 2026
- **Updated:** 23 Apr 2026
- **Also known as:** GHSA-vrq9-2rh7-jjg5

## What is CVE-2026-2951?

CVE-2026-2951 is a medium-severity cross-site scripting vulnerability in Gutentor – Gutenberg Blocks – Page Builder for Gutenberg Editor, published on 23 Apr 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

The Gutentor – Gutenberg Blocks – Page Builder for Gutenberg Editor plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 3.5.5 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

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

## Which versions are affected by CVE-2026-2951?


## How do I fix CVE-2026-2951?

No fix has been published for CVE-2026-2951 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-2951 being exploited?

There is no known exploitation of CVE-2026-2951 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-2951 and fix it if it is affected.

What it is: CVE-2026-2951 is a medium-severity cross-site scripting vulnerability in Gutentor – Gutenberg Blocks – Page Builder for Gutenberg Editor, published on 23 Apr 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-2951 in the wild and no public exploit code.

Affected product: Gutentor – Gutenberg Blocks – Page Builder for Gutenberg Editor. 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-2026-2951/ (Markdown: https://insights.sbomify.com/CVE-2026-2951/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-2951
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-2951
- OSV: https://osv.dev/vulnerability/CVE-2026-2951

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-2951/
Summaries are generated and may contain mistakes; the official description above is the record.