NN-2026:2-01
Stored Cross-Site Scripting (XSS) in Assets and Nodes in Guardian/CMC before 26.0.0
| Advisory ID | NN-2026:2-01 |
|---|---|
| Topic | Stored Cross-Site Scripting (XSS) in Assets and Nodes in Guardian/CMC before 26.0.0 |
| CWE Impact | CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') |
| Issue date | 2026-04-15 |
| Affects | Guardian, CMC < v26.0.0 |
| CVE Name(s) | CVE-2025-40899 |
| CVSS Details | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:H/VA:H/SC:L/SI:L/SA:L CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:H/A:H |
| CVSS Score | 7.1 (CVSS v4.0) 8.9 (CVSS v3.1) |
| CVE Risk Level | High (CVSS v4.0) High (CVSS v3.1) |
| Risk Level for Nozomi customers | High |
Summary
A Stored Cross-Site Scripting vulnerability was discovered in the Assets and Nodes functionality due to improper validation of an input parameter.
Impact
An authenticated user with custom fields privileges can define a malicious custom field containing a JavaScript payload. When the victim views the Assets or Nodes pages, 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.
Affected Products
Guardian, CMC < v26.0.0
Workarounds and Mitigations
Use internal firewall features to limit access to the web management interface. Review all accounts with access to it and delete unnecessary ones. Review existing custom fields.
Solutions
Upgrade to v26.0.0 or later.
Modification History
Related Links
Acknowledgements
We thank the following parties for their efforts:
- Andrea Palanca of Nozomi Networks Product Security team for finding this issue during an internal investigation
Contact
Nozomi Networks Product Security team can be reached at prodsec@nozominetworks.com.More contact details on the PSIRT page.