# CVE-2026-112329: Sensei LMS 4.26.4 Broken Access Control via save_new_message

> Authenticated attackers can bypass enrollment checks to send private messages to any course author by exploiting broken access control in the legacy message handler.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA: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 Oct 2026
- **Updated:** 27 Oct 2026
- **Also known as:** GHSA-32x8-68x9-4hfv

## What is CVE-2026-112329?

CVE-2026-112329 is a medium-severity missing authorization vulnerability in Automattic Sensei LMS, published on 19 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The Sensei LMS WordPress plugin before 4.26.4 contains a broken access control vulnerability in the legacy save_new_message handler hooked on the init action, which validates only a generic nonce without verifying course enrollment or restricting post_id to valid post types. Authenticated attackers, including unprivileged Subscribers, can supply an arbitrary post_id for any course, lesson, or quiz to create a private message addressed to that post's author, bypassing the enrollment checks enforced by the newer REST send-message controller.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-112329?


## How do I fix CVE-2026-112329?

No fix has been published for CVE-2026-112329 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-112329 being exploited?

There is no known exploitation of CVE-2026-112329 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-112329 and fix it if it is affected.

What it is: CVE-2026-112329 is a medium-severity missing authorization vulnerability in Automattic Sensei LMS, published on 19 Oct 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-2026-112329 in the wild and no public exploit code.

Affected product: Automattic Sensei LMS. 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-2026-112329/ (Markdown: https://insights.sbomify.com/CVE-2026-112329/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-112329
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-112329
- OSV: https://osv.dev/vulnerability/CVE-2026-112329

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-112329/
Summaries are generated and may contain mistakes; the official description above is the record.