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CVE-2026-111235— OpenNMS REST authorization bypass via non-canonical HTTP method

Quick assessment

Affected
The OpenNMS Group Meridian
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.

以下是该漏洞描述信息的中文翻译： 在多个版本的 OpenNMS Meridian 和 Horizon 的 REST API 中存在一个授权绕过漏洞。 Spring Security 过滤器链使用 规则对请求进行授权，这些规则将 HTTP 方法名称作为大写令牌进行比较（区分大小写），并且没有终止性的拒绝规则。使用非标准（例如全小写）方法令牌的请求无法匹配任何规则，从而在未经身份验证的情况下被处理。远程未经身份验证的攻击者可以通过 REST API 读取监控资产清单，创建、修改或删除资源，包括注入事件以伪造或抑制告警。

CVSS 9.1 · Critical

Affected Version Matrix 4

VendorProduct Version RangeStatus
The OpenNMS Group Horizon 36.0.0< 36.0.5 affected
The OpenNMS Group Meridian 2024.1.0< 2024.3.14 affected
2025.0.0< 2025.0.11 affected
2026.0.0< 2026.0.1 affected
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I. Basic Information for CVE-2026-111235

Vulnerability Information
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Vulnerability Title
OpenNMS REST authorization bypass via non-canonical HTTP method
Source: CVE Program / CVE List V5
Vulnerability Description
An authorization bypass vulnerability exists in the REST API of multiple versions of OpenNMS Meridian and Horizon. The /rest/** Spring Security filter chains authorize requests with intercept-url rules that name the HTTP method as an uppercase token, compare the method case-sensitively, and have no terminal deny rule. A request that uses a non-canonical (for example lowercase) method token matches no rule and is processed without authentication. A remote, unauthenticated attacker can read the monitored inventory and can create, modify, or delete resources through the REST API, which includes injecting events to fabricate or suppress alarms. The /rest/alarms chain has the same missing deny rule and discloses whether an alarm exists through a difference in the response. The fix adds a terminal deny rule to each REST filter chain. The solution is to upgrade to Meridian 2024.3.14, 2025.0.11, 2026.0.1 and Horizon 36.0.5 or newer. Meridian and Horizon installation instructions state that they are intended for installation within an organization's private networks and should not be directly accessible from the Internet.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
The OpenNMS Group Meridian 2024.1.0 ~ 2024.3.14 -
The OpenNMS Group Horizon 36.0.0 ~ 36.0.5 -

II. Public POCs for CVE-2026-111235

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III. Intelligence Information for CVE-2026-111235

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Patches & Fixes for CVE-2026-111235 (1)

IV. Related Vulnerabilities

Same product: Meridian
Same vendor: The OpenNMS Group
Same weakness: CWE-862

V. Comments for CVE-2026-111235

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