# CVE-2026-73157: cti-transmute Remote MISP Event Browser Allows Cross-Site Scripting via Malicious Event Metadata

> Attackers can inject scripts into the cti-transmute interface via malicious data from a remote MISP instance, potentially compromising user sessions.

- **Severity:** Low 2.3 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/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:** 11 Aug 2026
- **Updated:** 11 Aug 2026
- **Also known as:** GHSA-fh4x-m2h5-c6vx

## What is CVE-2026-73157?

CVE-2026-73157 is a low-severity cross-site scripting vulnerability in MISP cti-transmute, published on 11 Aug 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

Affected versions of cti-transmute render data obtained from a remote MISP instance into the event-browser interface using HTML interpolation. Because fields such as event IDs, event information, organization names, tags, tag colors, TLP labels, distribution labels, and error/flash text may be controlled by the remote MISP server, a malicious or compromised remote instance could return crafted values that inject HTML or script-capable content into the cti-transmute interface.

The patch explicitly notes that remote-derived values must not reach innerHTML, and replaces string-built rows and badges with DOM nodes populated through textContent. It also restricts remote-controlled tag colors to six-digit hexadecimal values, preventing malicious CSS values such as url(...).

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation), CWE-116 (Improper Encoding or Escaping of Output)

## Which versions are affected by CVE-2026-73157?


## How do I fix CVE-2026-73157?

No fix has been published for CVE-2026-73157 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-73157 being exploited?

There is no known exploitation of CVE-2026-73157 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-73157 and fix it if it is affected.

What it is: CVE-2026-73157 is a low-severity cross-site scripting vulnerability in MISP cti-transmute, published on 11 Aug 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-2026-73157 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-2026-73157/ (Markdown: https://insights.sbomify.com/CVE-2026-73157/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-73157
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-73157
- OSV: https://osv.dev/vulnerability/CVE-2026-73157

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-73157/
Summaries are generated and may contain mistakes; the official description above is the record.