# CVE-2026-41160: EspoCRM: Broken Access Control / IDOR in Note Pinning API allows unauthorized modification of notes

> Low-privileged users can modify note pinning status in EspoCRM due to a broken access control flaw in the API.

- **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:** 28 May 2026
- **Updated:** 28 May 2026
- **Also known as:** GHSA-c3rm-m24p-255p

## What is CVE-2026-41160?

CVE-2026-41160 is a medium-severity missing authorization vulnerability in espocrm, published on 28 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

EspoCRM is an open source customer relationship management application. Prior to 9.3.5, a business logic flaw (Broken Access Control) in EspoCRM 9.3.3 allows low-privileged users to pin arbitrary notes without having the required edit permissions for the parent object. Due to a "write first, authorize later" execution flaw in the backend API, even though the server correctly returns a 403 Forbidden error, the targeted note's pinned status is already persistently modified in the database. The root cause lies in the server-side processing of the POST /api/v1/Note/{id}/pin endpoint. In application/Espo/Tools/Stream/Api/PostNotePin.php, the process() method first calls getNote($id) before calling checkParent($note). This vulnerability is fixed in 9.3.5.

Weakness: CWE-862 (Missing Authorization), CWE-639 (Authorization Bypass Through User-Controlled Key), CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2026-41160?


## How do I fix CVE-2026-41160?

No fix has been published for CVE-2026-41160 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-41160 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-41160 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-41160 and fix it if it is affected.

What it is: CVE-2026-41160 is a medium-severity missing authorization vulnerability in espocrm, published on 28 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-41160 exists.

Affected product: espocrm. 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-2026-41160/ (Markdown: https://insights.sbomify.com/CVE-2026-41160/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-41160
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-41160
- OSV: https://osv.dev/vulnerability/CVE-2026-41160

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-41160/
Summaries are generated and may contain mistakes; the official description above is the record.