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CVE-2026-26988— LibreNMS: SQL Injection in ajax_table.php spreads through a covert data stream

Quick assessment

Affected
librenms librenms
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.

LibreNMS是LibreNMS社区的一套基于PHP和MySQL的开源网络监控系统。该系统具有自定义警报、自动发现网络环境和自动更新等特点。 LibreNMS 25.12.0及之前版本存在SQL注入漏洞，该漏洞源于ajax_table.php端点处理IPv6地址搜索时输入清理或参数化不当，可能导致SQL注入攻击。

AI Predicted 9.8 Difficulty: Easy EPSS 0.49% · P40

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-26988

Vulnerability Information
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Vulnerability Title
LibreNMS: SQL Injection in ajax_table.php spreads through a covert data stream
Source: CVE Program / CVE List V5
Vulnerability Description
LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Versions 25.12.0 and below contain an SQL Injection vulnerability in the ajax_table.php endpoint. The application fails to properly sanitize or parameterize user input when processing IPv6 address searches. Specifically, the address parameter is split into an address and a prefix, and the prefix portion is directly concatenated into the SQL query string without validation. This allows an attacker to inject arbitrary SQL commands, potentially leading to unauthorized data access or database manipulation. This issue has been fixed in version 26.2.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
SQL命令中使用的特殊元素转义处理不恰当(SQL注入)
Source: CVE Program / CVE List V5
Vulnerability Title
LibreNMS SQL注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LibreNMS是LibreNMS社区的一套基于PHP和MySQL的开源网络监控系统。该系统具有自定义警报、自动发现网络环境和自动更新等特点。 LibreNMS 25.12.0及之前版本存在SQL注入漏洞，该漏洞源于ajax_table.php端点处理IPv6地址搜索时输入清理或参数化不当，可能导致SQL注入攻击。
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
librenms librenms < 26.2.0 -

II. Public POCs for CVE-2026-26988

# POC Description Source Link Shenlong Link
1 None https://github.com/mbanyamer/CVE-2026-26988-LibreNMS-SQLi POC Details
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III. Intelligence Information for CVE-2026-26988

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Vendor Advisories for CVE-2026-26988 (1)

Same Patch Batch · librenms · 2026-02-20 · 7 CVEs total

CVE-2026-26990 8.8 HIGH LibreNMS has Time-Based Blind SQL Injection in address-search.inc.php
CVE-2026-27016 5.4 MEDIUM LibreNMS has Stored XSS in Custom OID - unit parameter missing strip_tags()
CVE-2026-26989 4.3 MEDIUM LibreNMS has Stored XSS in Alert Rule
CVE-2026-26992 LibreNMS has Stored Cross-Site Scripting via unsanitized /port-groups name
CVE-2026-26991 LibreNMS vulnerable to Stored Cross-site Scripting through unsanitized /device-groups name
CVE-2026-26987 LibreNMS affected by reflected XSS via email field

IV. Related Vulnerabilities

Same product: librenms
Same vendor: librenms
Same weakness: CWE-89

V. Comments for CVE-2026-26988

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