Quick answers
- Is CVE-2026-31981 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-31981 being exploited in the wild.
- How severe is CVE-2026-31981?
- Medium severity, with a CVSS score of 5.9, published 9 July 2026.
- Which products and versions are affected?
- Nozomi Networks Guardian < 26.2.0.
- Is there a fix for CVE-2026-31981?
- A patch was published on 2026-07-07: Version 26.2.0 released to address the vulnerability Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-31981 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-31981?
- Check whether you run Nozomi Networks Guardian at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A Stored HTML Injection vulnerability exists in the Diagram tab and Graph view of Nozomi Networks Guardian and CMC (N2OS) prior to version 26.2.0. The root cause is an insufficiently restrictive shared input validation function that fails to properly sanitize configuration data. An authenticated attacker with administrative privileges can inject malicious HTML tags via multiple input vectors. When a victim views the compromised data, the HTML is rendered in their browser, enabling phishing and open redirect attacks. Full Cross-Site Scripting (XSS) and data exfiltration are mitigated by existing input validation and a configured Content Security Policy (CSP). The issue is resolved in version 26.2.0.
Affected products
- Nozomi Networks Guardian < 26.2.0
- Nozomi Networks CMC < 26.2.0
Timeline
- 2026-07-07: advisory: Initial advisory published by Nozomi Networks
- 2026-07-09: disclosed: NVD publication date
- 2026-07-07: patched: Version 26.2.0 released to address the vulnerability