# CVE-2026-11900: Information disclosure in Ad Inserter – Ad Manager & AdSense Ads

> Authenticated contributors can read arbitrary private or draft post content via an insecure shortcode attribute in the Ad Inserter plugin.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/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:** 3 Jul 2026
- **Updated:** 7 Jul 2026
- **Also known as:** GHSA-ppgc-36hr-q23g

## What is CVE-2026-11900?

CVE-2026-11900 is a medium-severity vulnerability in spacetime Ad Inserter – Ad Manager & AdSense Ads, published on 3 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The Ad Inserter – Ad Manager & AdSense Ads plugin for WordPress is vulnerable to Insecure Direct Object Reference in versions up to and including 2.8.16 via the 'data' attribute of the [adinserter] shortcode. This is due to the replace_ai_tags() function processing a {reusable-block-N} tag pattern that calls get_post_field('post_content', N) without verifying the requesting user's capability with current_user_can('read_post'), without restricting the post type to 'wp_block', and without checking the post status. This makes it possible for authenticated attackers, with Contributor-level access and above, to read the full content of arbitrary posts including Private, Draft, Pending, Trashed, and password-protected posts owned by other users, by placing the shortcode in a post they own and previewing it.

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

## Which versions are affected by CVE-2026-11900?


## How do I fix CVE-2026-11900?

No fix has been published for CVE-2026-11900 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-11900 being exploited?

There is no known exploitation of CVE-2026-11900 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-11900 and fix it if it is affected.

What it is: CVE-2026-11900 is a medium-severity vulnerability in spacetime Ad Inserter – Ad Manager & AdSense Ads, published on 3 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-2026-11900 in the wild and no public exploit code.

Affected product: spacetime Ad Inserter – Ad Manager & AdSense Ads. 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-2026-11900/ (Markdown: https://insights.sbomify.com/CVE-2026-11900/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-11900
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-11900
- OSV: https://osv.dev/vulnerability/CVE-2026-11900

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-11900/
Summaries are generated and may contain mistakes; the official description above is the record.