# CVE-2026-95661: MISP Reflected Cross-Site Scripting in Attribute Histogram via Unescaped URL-Supplied Type List

> Reflected XSS in MISP allows attackers to execute JavaScript in authenticated users' browsers via crafted URLs, potentially stealing sessions or data.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/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:** A user has to click or open something
- **Fix available:** No
- **Published:** 22 Sep 2026
- **Updated:** 22 Sep 2026
- **Also known as:** GHSA-3m75-rwwr-268p

## What is CVE-2026-95661?

CVE-2026-95661 is a medium-severity cross-site scripting vulnerability in MISP, published on 22 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

MISP contains a reflected cross-site scripting (XSS) vulnerability in the attribute histogram view. The $selectedTypes variable, which is derived from the URL path segment , was interpolated directly into a JavaScript array literal inside an onClick HTML attribute without any encoding or escaping. An attacker who can cause an authenticated MISP user to visit a crafted URL containing a malicious type value can execute arbitrary JavaScript in the victim's browser within the MISP application origin.

Successful exploitation allows the attacker to read session cookies, perform actions on behalf of the victim, or exfiltrate sensitive data accessible from the MISP interface. 

The vulnerability requires the victim to be authenticated and to actively navigate to the attacker-supplied URL.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-95661?


## How do I fix CVE-2026-95661?

No fix has been published for CVE-2026-95661 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-95661 being exploited?

There is no known exploitation of CVE-2026-95661 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-95661 and fix it if it is affected.

What it is: CVE-2026-95661 is a medium-severity cross-site scripting vulnerability in MISP, published on 22 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-95661 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-2026-95661/ (Markdown: https://insights.sbomify.com/CVE-2026-95661/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-95661
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-95661
- OSV: https://osv.dev/vulnerability/CVE-2026-95661

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-95661/
Summaries are generated and may contain mistakes; the official description above is the record.