# CVE-2025-40890 — Nozomi Networks Guardian

> As of 2025-11-26, CVE-2025-40890 is a HIGH-severity vulnerability in Nozomi Networks Guardian, CVSS v3.1 7.9, EPSS 0.1% (8.2th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2025-40890, most recently “Multiple Vulnerabilities in Nozomi Guardian/CMC Before 25.4.0 on Siemens RUGGEDCOM APE1808 Devices (CVE-2024-13089, CVE-2024-13090, CVE-2025-3719, CVE-2025-40889, et al.)”.

**Last updated:** 2025-11-26

## What is CVE-2025-40890?

A Stored Cross-Site Scripting vulnerability was discovered in the Dashboards functionality due to improper validation of an input parameter. An authenticated low-privilege user can craft a malicious dashboard containing a JavaScript payload and share it with victim users, or a victim can be socially engineered to import a malicious dashboard template. When the victim views or imports the dashboard, the XSS executes in their browser context, allowing the attacker to perform unauthorized actions as the victim, such as modify application data, disrupt application availability, and access limited sensitive information.

The record classifies CVE-2025-40890 under weakness class [CWE-79](https://intel.threadlinqs.com/cwe/CWE-79). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs a user to take an action first, and has high impact on integrity, availability. 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 319 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.9 — HIGH (`CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:H`)
- **CVSS v4.0 base score:** 5.8 (`CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:A/VC:L/VI:H/VA:H/SC:L/SI:L/SA:L`)
- **EPSS (FIRST):** 0.1% probability of exploitation in the next 30 days, higher than 8.2% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.3/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2025-11-25, last modified 2025-11-26

## Is CVE-2025-40890 being exploited?

It currently carries a trending score of 7 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Nozomi Networks](https://intel.threadlinqs.com/vendors/nozomi-networks): Guardian, CMC

## How to fix CVE-2025-40890

No vendor patch reference has been recorded for CVE-2025-40890 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2025-40890

1 tracked threat in the Threadlinqs corpus references CVE-2025-40890, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Multiple Vulnerabilities in Nozomi Guardian/CMC Before 25.4.0 on Siemens RUGGEDCOM APE1808 Devices (CVE-2024-13089, CVE-2024-13090, CVE-2025-3719, CVE-2025-40889, et al.)](https://intel.threadlinqs.com/threat/TL-2026-2487) — HIGH · 2026-09-13

## Sources

Enriched from CVE.org, FIRST EPSS. Last verified by Threadlinqs on 2026-10-10.

**Other references**

- [security.nozominetworks.com](https://security.nozominetworks.com/NN-2025:11-01)

Canonical: https://intel.threadlinqs.com/cve/CVE-2025-40890
Full detection coverage and IOCs for threats exploiting CVE-2025-40890 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp