🛡️ CVE-2026-31981 — cmc

🟡 CVSS 5.9 — Medium ✅ No Known Exploit CWE-79 NVD
5.9
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

A Stored HTML Injection vulnerability was discovered in the Diagram tab and Graph view due to a shared input validation function being insufficiently restrictive. An authenticated user with administrative privileges can inject malicious HTML tags into N2OS configuration data through multiple input vectors. When a victim views the affected data in the Diagram tab and Graph view, 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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs administrative privileges on the target. A user must be tricked into taking some action. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality low, integrity low, availability low.

Weakness class

CVE-2026-31981 is classified as CWE-79: Cross-site Scripting (XSS). User-supplied data is written into a page without escaping, so attacker script runs in the browser of anyone who views it.

Affected software

CVE-2026-31981 is recorded against 2 packages.

  • cmc (fixed in 26.2.0)
  • guardian (fixed in 26.2.0)

Timeline and source

Published on 9 July 2026 and last revised on 10 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

security.nozominetworks.com

Details

Severity MEDIUM
CVSS Score 5.9
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L
CWE CWE-79
Public Exploit ✅ No
Source NVD
Published 2026-07-09
Updated 2026-08-11
Modified 2026-07-10
Fix URL N/A

Affected Packages

Software From version Fixed in
cmc — 26.2.0
guardian — 26.2.0

References

Similar Threats

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