# CVE-2026-33387: Insufficient sanitization of Dashboards in Guardian/CMC before 26.3.0

> Authenticated attackers can execute malicious code in victim browsers via template injection in Dashboards, modifying data or causing denial of service.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:L/SC:N/SI:N/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:** 8 Sep 2026
- **Updated:** 15 Oct 2026
- **Also known as:** GHSA-xp2q-mg9h-jmmm

## What is CVE-2026-33387?

CVE-2026-33387 is a medium-severity code injection vulnerability in Nozomi Networks CMC, published on 8 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

A template injection vulnerability was discovered in the Dashboards functionality due to improper validation of an input parameter. An authenticated user with the required privileges can define a dashboard containing a malicious payload, or a victim can be socially engineered into importing a malicious dashboard. When the victim views or imports the dashboard, the payload executes in their browser context, allowing the attacker to modify application data or disrupt application availability.

Weakness: CWE-1336 (Improper Neutralization of Special Elements Used in a Template Engine)

## Which versions are affected by CVE-2026-33387?


## How do I fix CVE-2026-33387?

No fix has been published for CVE-2026-33387 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-33387 being exploited?

There is no known exploitation of CVE-2026-33387 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-33387 and fix it if it is affected.

What it is: CVE-2026-33387 is a medium-severity code injection vulnerability in Nozomi Networks CMC, published on 8 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-2026-33387 in the wild and no public exploit code.

Affected product: Nozomi Networks CMC. 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-2026-33387/ (Markdown: https://insights.sbomify.com/CVE-2026-33387/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-33387
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-33387
- OSV: https://osv.dev/vulnerability/CVE-2026-33387

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-33387/
Summaries are generated and may contain mistakes; the official description above is the record.