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CVE-2026-31981— HTML injection in Diagram tab and Graph view in Guardian/CMC before 26.2.0

Quick assessment

Affected
Nozomi Networks Guardian
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Nozomi Networks Guardian是美国Nozomi Networks公司的网络安全产品。 Nozomi Networks Guardian 26.2.0之前版本和Nozomi Networks CMC 26.2.0之前版本存在跨站脚本漏洞，该漏洞源于共享输入验证函数限制不足，导致Diagram标签和Graph视图存在存储型HTML注入漏洞，允许经过身份验证的管理员用户通过多个输入向量向N2OS配置数据中注入恶意HTML标签，当受害者查看受影响的Diagram标签或Graph视图数据时，注入

CVSS 5.9 · Medium EPSS 0.25% · P15

Affected Version Matrix 2

VendorProduct Version RangeStatus
Nozomi Networks CMC < 26.2.0 affected
Nozomi Networks Guardian < 26.2.0 affected
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I. Basic Information for CVE-2026-31981

Vulnerability Information
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Vulnerability Title
HTML injection in Diagram tab and Graph view in Guardian/CMC before 26.2.0
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Nozomi Networks Guardian 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nozomi Networks Guardian是美国Nozomi Networks公司的网络安全产品。 Nozomi Networks Guardian 26.2.0之前版本和Nozomi Networks CMC 26.2.0之前版本存在跨站脚本漏洞，该漏洞源于共享输入验证函数限制不足，导致Diagram标签和Graph视图存在存储型HTML注入漏洞，允许经过身份验证的管理员用户通过多个输入向量向N2OS配置数据中注入恶意HTML标签，当受害者查看受影响的Diagram标签或Graph视图数据时，注入
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Nozomi Networks Guardian 0 ~ 26.2.0 -
Nozomi Networks CMC 0 ~ 26.2.0 -

II. Public POCs for CVE-2026-31981

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III. Intelligence Information for CVE-2026-31981

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Vendor Advisories for CVE-2026-31981 (1)

Same Patch Batch · Nozomi Networks · 2026-07-09 · 6 CVEs total

CVE-2026-31985 8.1 HIGH Disabled and non-configurable TLS certificate validation in n2os-tui when connecting the R
CVE-2026-33390 8.1 HIGH Incorrect privilege assignment for Arc sensors in Guardian/CMC before 26.2.0
CVE-2026-31984 7.5 HIGH DoS through oversized audit log entries in Guardian/CMC before 26.2.0
CVE-2026-31982 7.1 HIGH Open Redirect in SAML Single Sign-On in Guardian/CMC before 26.2.0
CVE-2026-31983 5.3 MEDIUM Missing authentication in SSH keys synchronization endpoint in Guardian/CMC before 26.2.0

IV. Related Vulnerabilities

Same product: Guardian
Same vendor: Nozomi Networks
Same weakness: CWE-79

V. Comments for CVE-2026-31981

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