# CVE-2026-12904: Missing authorization in Kadence Blocks — Page Builder Toolkit for Gutenberg Editor

> Authenticated contributors can read or delete other users' optimizer data by mismatching post IDs and paths in Kadence Blocks.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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:** 1 Jul 2026
- **Updated:** 1 Jul 2026
- **Also known as:** GHSA-pjfr-44xr-rrw5

## What is CVE-2026-12904?

CVE-2026-12904 is a medium-severity missing authorization vulnerability in stellarwp Kadence Blocks — Page Builder Toolkit for Gutenberg Editor, published on 1 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The Kadence Blocks – Gutenberg Blocks for Page Builder Features plugin for WordPress is vulnerable to Insecure Direct Object Reference in versions up to and including 3.7.7. This is due to a mismatch between the object used for authorization and the object actually accessed in the Optimize_Rest_Controller's create_item(), get_item(), delete_item(), and bulk_delete_items() endpoints — authorization is checked via current_user_can('edit_post'/'delete_post', $post_id) against the user-supplied post_id, while the storage layer keys analysis records on sha256($post_path) from a separately supplied, attacker-controlled post_path parameter, with no enforcement that post_path corresponds to post_id. This makes it possible for authenticated attackers, with Contributor-level access and above, to read or delete optimizer analysis records belonging to posts owned by other users by submitting their own post_id (which passes the capability check) together with the victim post's path.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2026-12904?


## How do I fix CVE-2026-12904?

No fix has been published for CVE-2026-12904 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-12904 being exploited?

There is no known exploitation of CVE-2026-12904 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-12904 and fix it if it is affected.

What it is: CVE-2026-12904 is a medium-severity missing authorization vulnerability in stellarwp Kadence Blocks — Page Builder Toolkit for Gutenberg Editor, published on 1 Jul 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-2026-12904 in the wild and no public exploit code.

Affected product: stellarwp Kadence Blocks — Page Builder Toolkit 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-2026-12904/ (Markdown: https://insights.sbomify.com/CVE-2026-12904/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-12904
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-12904
- OSV: https://osv.dev/vulnerability/CVE-2026-12904

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-12904/
Summaries are generated and may contain mistakes; the official description above is the record.