# CVE-2025-40902: HTML injection in Users in Guardian/CMC before 26.1.0

> An authenticated admin can inject HTML into usernames, enabling phishing or open redirects when victims delete groups, though CSP limits direct XSS impact.

- **Severity:** Medium 4.8 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 19 May 2026
- **Updated:** 11 Aug 2026
- **Also known as:** GHSA-qhx5-6j68-67q4

## What is CVE-2025-40902?

CVE-2025-40902 is a medium-severity cross-site scripting vulnerability in Nozomi Networks CMC, published on 19 May 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

A Stored HTML Injection vulnerability was discovered in the Users functionality due to improper validation of an input parameter. An authenticated user with administrative privileges can create a malicious user whose username contains HTML tags. When a victim attempts to delete a group containing the affected user, the injected HTML renders in their browser, enabling phishing and possibly open redirect attacks. Full XSS exploitation and direct information disclosure are prevented by the existing input validation and Content Security Policy configuration.

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

## Which versions are affected by CVE-2025-40902?

It affects 2 products.


Products: Nozominetworks Cmc, Nozominetworks Guardian.

## How do I fix CVE-2025-40902?

No fix has been published for CVE-2025-40902 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-40902 being exploited?

There is no known exploitation of CVE-2025-40902 in the wild and no public exploit code.

## Other vulnerabilities in Nozomi Networks CMC

- [CVE-2023-29245](https://insights.sbomify.com/CVE-2023-29245/): SQL Injection on IDS parsing of malformed asset fields in Guardian/CMC >= 22.6.0 before 22.6.3 and 23.1.0 (critical 9.2)
- [CVE-2026-31984](https://insights.sbomify.com/CVE-2026-31984/): DoS through oversized audit log entries in Guardian/CMC before 26.2.0 (high 8.7)
- [CVE-2023-2567](https://insights.sbomify.com/CVE-2023-2567/): Authenticated SQL Injection on Query functionality in Guardian/CMC before 22.6.3 and 23.1.0 (high 8.7)
- [CVE-2023-22378](https://insights.sbomify.com/CVE-2023-22378/): Authenticated Blind SQL Injection on sorting in Guardian/CMC before 22.6.2 (high 8.7)
- [CVE-2023-23574](https://insights.sbomify.com/CVE-2023-23574/): Authenticated Blind SQL Injection on alerts count in Guardian/CMC before 22.6.2 (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-40902 and fix it if it is affected.

What it is: CVE-2025-40902 is a medium-severity cross-site scripting vulnerability in Nozomi Networks CMC, published on 19 May 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2025-40902 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-2025-40902/ (Markdown: https://insights.sbomify.com/CVE-2025-40902/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-40902
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-40902
- OSV: https://osv.dev/vulnerability/CVE-2025-40902

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-40902/
Summaries are generated and may contain mistakes; the official description above is the record.