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CVE-2026-48551— Nagios Core / XI CSRF Protection Bypass via Double-Submit Cookie

Quick assessment

Affected
Nagios Enterprises, LLC. Nagios Core
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

nagios core是Nagios公司开源的一款网络监控软件。 nagios core 4.5.14之前版本和Nagios XI 2026R1.7之前版本存在跨站请求伪造漏洞，该漏洞源于通过自提供的双重提交cookie绕过跨站请求伪造保护，攻击者可提供匹配的cookie和请求参数值绕过CSRF保护，导致未经身份验证的攻击者通过恶意链接以授权用户身份运行命令。

CVSS 7.4 · High EPSS 0.26% · P17

Affected Version Matrix 2

VendorProduct Version RangeStatus
Nagios Enterprises, LLC. Nagios Core < 4.5.14 affected
Nagios Enterprises, LLC. Nagios XI < 2026R1.7 affected
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I. Basic Information for CVE-2026-48551

Vulnerability Information
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Vulnerability Title
Nagios Core / XI CSRF Protection Bypass via Double-Submit Cookie
Source: CVE Program / CVE List V5
Vulnerability Description
Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 contain a cross-site request forgery protection bypass via a self-supplied double-submit cookie. An attacker can supply matching cookie and request parameter values to bypass CSRF protection, enabling unauthenticated attackers to run commands as authorized users via malicious links.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨站请求伪造(CSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
nagios core 跨站请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
nagios core是Nagios公司开源的一款网络监控软件。 nagios core 4.5.14之前版本和Nagios XI 2026R1.7之前版本存在跨站请求伪造漏洞，该漏洞源于通过自提供的双重提交cookie绕过跨站请求伪造保护，攻击者可提供匹配的cookie和请求参数值绕过CSRF保护，导致未经身份验证的攻击者通过恶意链接以授权用户身份运行命令。
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
Nagios Enterprises, LLC. Nagios Core 0 ~ 4.5.14 -
Nagios Enterprises, LLC. Nagios XI 0 ~ 2026R1.7 -

II. Public POCs for CVE-2026-48551

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9533 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-48551

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Vendor Advisories for CVE-2026-48551 (2)

Vendor Pages for CVE-2026-48551 (1)

Same Patch Batch · Nagios Enterprises, LLC. · 2026-08-12 · 5 CVEs total

CVE-2026-48554 7.5 HIGH Nagios Core / XI Authenticated RCE via Unfiltered NOTIFICATION-Family Macro Substitution
CVE-2026-48553 7.5 HIGH Nagios Core / XI Authenticated RCE via Custom-Variable Macro Injection
CVE-2026-48550 6.1 MEDIUM Nagios Core / XI cmd.cgi Reflected XSS via NagFormId Parameter
CVE-2026-48552 5.4 MEDIUM Nagios Core / XI DOM-based XSS via jsonquery.js

IV. Related Vulnerabilities

Same product: Nagios Core
Same vendor: Nagios Enterprises, LLC.
Same weakness: CWE-352

V. Comments for CVE-2026-48551

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