# CVE-2026-86408: MISP Missing Authorization in Cryptographic Key View Exposes Signing Keys from Protected Events

> Authenticated users can view cryptographic signing keys from protected events due to missing authorization checks in the key viewing controller.

- **Severity:** High 7.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/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:** 7 Sep 2026
- **Updated:** 8 Sep 2026
- **Also known as:** GHSA-2qxh-mhcg-87xg

## What is CVE-2026-86408?

CVE-2026-86408 is a high-severity missing authorization vulnerability in Misp-Project Misp, published on 7 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Affected versions of MISP do not enforce parent-event visibility when serving cryptographic keys through CryptographicKeysController::view().

The vulnerable handler queried CryptographicKey directly using the supplied key ID and selected sensitive fields such as:

  *  
type

  *  
key_data

  *  
fingerprint

but did not fetch or authorize the associated parent event first.

The upstream commit explicitly states that cryptographicKeys/view could return a protected event’s signing key to any authenticated user.

The fix adds parent_id and parent_type to the lookup and then enforces authorization through the associated event using fetchSimpleEvent($user, parent_id). If the parent is not an Event, access is limited to site administrators.

Version affected: ≤2.5.45

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

## Which versions are affected by CVE-2026-86408?

It affects 1 product.


Products: Misp-Project Misp.

## How do I fix CVE-2026-86408?

No fix has been published for CVE-2026-86408 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-86408 being exploited?

There is no known exploitation of CVE-2026-86408 in the wild and no public exploit code.

## Other vulnerabilities in Misp-Project Misp

- [CVE-2024-46918](https://insights.sbomify.com/CVE-2024-46918/): Missing authorization in n/a (critical 9.8)
- [CVE-2024-45509](https://insights.sbomify.com/CVE-2024-45509/): Missing authorization in n/a (critical 9.8)
- [CVE-2024-29858](https://insights.sbomify.com/CVE-2024-29858/): File upload in n/a (critical 9.8)
- [CVE-2024-29859](https://insights.sbomify.com/CVE-2024-29859/): File upload in n/a (critical 9.8)
- [CVE-2024-25674](https://insights.sbomify.com/CVE-2024-25674/): File upload in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-86408 and fix it if it is affected.

What it is: CVE-2026-86408 is a high-severity missing authorization vulnerability in Misp-Project Misp, published on 7 Sep 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-2026-86408 in the wild and no public exploit code.

Affected product: Misp-Project Misp. 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-2026-86408/ (Markdown: https://insights.sbomify.com/CVE-2026-86408/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-86408
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-86408
- OSV: https://osv.dev/vulnerability/CVE-2026-86408

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-86408/
Summaries are generated and may contain mistakes; the official description above is the record.