# CVE-2026-93296: MISP Overmind: Stored Cross-Site Scripting via Unescaped Object Names in Statistics Legends

> An attacker with low-level access can inject malicious scripts into MISP Overmind statistics legends, leading to session hijacking or data exfiltration when victims view the dashboard.

- **Severity:** High 8.5 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 17 Sep 2026
- **Updated:** 22 Sep 2026
- **Also known as:** GHSA-rfmv-f8jw-7mhw

## What is CVE-2026-93296?

CVE-2026-93296 is a high-severity cross-site scripting vulnerability in misp, published on 17 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

MISP contains a stored cross-site scripting (XSS) vulnerability in the Overmind theme's statistics views. The event General card and the server/feed preview card constructed donut chart legend labels by directly concatenating object name or category keys into an innerHTML string without HTML-encoding. Because MISP object names are user-controllable by any authenticated user with sufficient permissions to create or modify such objects, an attacker could craft a name containing malicious markup. When any other user viewed the affected Overmind dashboard, the injected markup would be interpreted as live HTML/JavaScript in the victim's browser, executing in the context of the MISP application origin. This could allow session hijacking, data exfiltration, or arbitrary actions performed on behalf of the victim. 

The vulnerability requires the attacker to have low-level authenticated access to create or rename an object whose name is rendered in the legend, and the victim to view the Overmind event or server preview page. No special browser conditions or race conditions are required.

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

## Which versions are affected by CVE-2026-93296?


## How do I fix CVE-2026-93296?

No fix has been published for CVE-2026-93296 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-93296 being exploited?

There is no known exploitation of CVE-2026-93296 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-93296 and fix it if it is affected.

What it is: CVE-2026-93296 is a high-severity cross-site scripting vulnerability in misp, published on 17 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-93296 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-2026-93296/ (Markdown: https://insights.sbomify.com/CVE-2026-93296/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-93296
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-93296
- OSV: https://osv.dev/vulnerability/CVE-2026-93296

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-93296/
Summaries are generated and may contain mistakes; the official description above is the record.