# CVE-2026-85546: MISP Sharing Group Quick-Edit Actions Allow CSRF via State-Changing GET Requests

> Attackers can force authenticated users to modify sharing group memberships via crafted GET requests, potentially granting unauthorized access or disrupting information sharing.

- **Severity:** High 8.6 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:L/SC:N/SI:L/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Sep 2026
- **Updated:** 10 Sep 2026
- **Also known as:** GHSA-cwc4-rgpg-99q3

## What is CVE-2026-85546?

CVE-2026-85546 is a high-severity vulnerability in misp, published on 4 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

MISP contains a cross-site request forgery (CSRF) vulnerability in the sharing group quick-edit functionality. The addOrg, removeOrg, addServer, and removeServer actions share the __initialiseSGQuickEdit() helper, where the HTTP method validation intended to restrict these operations to POST requests was commented out.

As a result, these state-changing actions could be invoked using GET requests. An attacker could craft a URL targeting one of the affected actions and cause an authenticated MISP user with sufficient privileges to request it, for example through a malicious link or embedded web resource.

Successful exploitation could modify the membership of a MISP sharing group without the victim intentionally performing the operation. Depending on the action performed, an attacker could add or remove organisations or servers from a sharing group, potentially granting unintended access to information distributed through that sharing group or disrupting legitimate information sharing.

The patch restores HTTP method enforcement centrally in __initialiseSGQuickEdit() by calling allowMethod(['post']), ensuring that all four affected quick-edit operations require POST requests and are therefore subject to the application's normal protections for state-changing requests.

Weakness: CWE-352 (Cross-Site Request Forgery)

## Which versions are affected by CVE-2026-85546?


## How do I fix CVE-2026-85546?

No fix has been published for CVE-2026-85546 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-85546 being exploited?

There is no known exploitation of CVE-2026-85546 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-85546 and fix it if it is affected.

What it is: CVE-2026-85546 is a high-severity vulnerability in misp, published on 4 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-85546 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-2026-85546/ (Markdown: https://insights.sbomify.com/CVE-2026-85546/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-85546
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-85546
- OSV: https://osv.dev/vulnerability/CVE-2026-85546

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-85546/
Summaries are generated and may contain mistakes; the official description above is the record.