# CVE-2026-54361: MISP mass assignment vulnerabilities allow unauthorized modification of ownership and delegation records

> Authenticated attackers can modify ownership and delegation records in MISP via mass assignment, leading to unauthorized data modification and potential access to sensitive threat intelligence.

- **Severity:** High 8.8 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:L/SI:L/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 12 Jun 2026
- **Updated:** 15 Jun 2026
- **Also known as:** GHSA-94hj-x7j9-542x

## What is CVE-2026-54361?

CVE-2026-54361 is a high-severity missing authorization vulnerability in misp, published on 12 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

MISP contained multiple mass assignment vulnerabilities in the handling of collections, tag collections, event delegations, and shadow attributes. Several controller actions accepted user-supplied fields that should have remained server-controlled, including record identifiers and ownership-related fields such as id, org_id, orgc_id, and user_id.

An authenticated attacker with access to the affected endpoints could craft requests containing protected fields in order to alter object ownership, redirect an update to another record, overwrite existing event delegation requests, or modify shadow attribute proposals belonging to another organization. This could result in unauthorized modification of MISP objects and, depending on object visibility and sharing configuration, unauthorized access to or transfer of sensitive threat intelligence data.

The issue was fixed by explicitly pinning ownership and identity fields to their stored values during edit operations and by removing user-supplied primary keys from create-only save paths.

Affected components:

  *  CollectionsController::edit()
  *  EventDelegationsController::delegateEvent()
  *  ShadowAttributesController::edit()
  *  TagCollectionsController::edit()915
  *  TagCollectionsController::editWithTags()

Attack requirements:
The attacker must be authenticated and able to reach the affected MISP endpoints. No user interaction is required.

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

## Which versions are affected by CVE-2026-54361?


## How do I fix CVE-2026-54361?

No fix has been published for CVE-2026-54361 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-54361 being exploited?

There is no known exploitation of CVE-2026-54361 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-54361 and fix it if it is affected.

What it is: CVE-2026-54361 is a high-severity missing authorization vulnerability in misp, published on 12 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-54361 in the wild and no public exploit code.

Affected product: 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-2026-54361/ (Markdown: https://insights.sbomify.com/CVE-2026-54361/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-54361
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-54361
- OSV: https://osv.dev/vulnerability/CVE-2026-54361

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-54361/
Summaries are generated and may contain mistakes; the official description above is the record.