# CVE-2026-73158: cti-transmute Saved Graph Configuration Allows Stored Cross-Site Scripting via svgIcon

> A stored XSS vulnerability in cti-transmute allows attackers to execute scripts in other users' browsers via malicious graph configurations.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/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:** 11 Aug 2026
- **Updated:** 11 Aug 2026
- **Also known as:** GHSA-j8cv-pjx7-pvqf

## What is CVE-2026-73158?

CVE-2026-73158 is a medium-severity cross-site scripting vulnerability in MISP cti-transmute, published on 11 Aug 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

Affected versions of cti-transmute insufficiently validate saved graph configuration data. Graph configurations can contain style properties that are later consumed by Pivotick, and Pivotick interprets svgIcon as HTML. Because saved configurations may be created by one user and later displayed to other users—including administrators—a malicious user could store a crafted svgIcon value that executes script in another viewer’s browser.

The fix introduces a strict configuration schema on both the server and client. Only known properties are accepted, style entries are limited to shape, color, and size, and dangerous properties such as svgIcon and iconClass are explicitly rejected. Existing stored configurations are also sanitized when listed and again before being applied in the browser.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation), CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2026-73158?


## How do I fix CVE-2026-73158?

No fix has been published for CVE-2026-73158 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-73158 being exploited?

There is no known exploitation of CVE-2026-73158 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-73158 and fix it if it is affected.

What it is: CVE-2026-73158 is a medium-severity cross-site scripting vulnerability in MISP cti-transmute, published on 11 Aug 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-2026-73158 in the wild and no public exploit code.

Affected product: MISP cti-transmute. 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-2026-73158/ (Markdown: https://insights.sbomify.com/CVE-2026-73158/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-73158
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-73158
- OSV: https://osv.dev/vulnerability/CVE-2026-73158

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-73158/
Summaries are generated and may contain mistakes; the official description above is the record.