CVE-2026-40248— free5gc UDR improper path validation allows unauthenticated creation and modification of Traffic Influence Subscriptions

free5gc UDR improper path validation allows unauthenticated creation and modification of Traffic Influence Subscriptions

free5GC is an open-source implementation of the 5G core network. In versions 4.2.1 and below of the UDR service, the handler for creating or updating Traffic Influence Subscriptions checks whether the influenceId path segment equals subs-to-notify, but does not return after sending the HTTP 404 response when validation fails. Execution continues and the subscription is created or overwritten regardless. An unauthenticated attacker with access to the 5G Service Based Interface can create or overwrite arbitrary Traffic Influence Subscriptions, including injecting attacker-controlled notificationUri values and arbitrary SUPIs, by supplying any value for the influenceId path segment. A patched version was not available at the time of publication.

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授权机制不恰当

free5GC 安全漏洞

free5GC是free5GC开源的一个第 5 代 (5G) 移动核心网络的开源项目。 free5GC 4.2.1及之前版本存在安全漏洞，该漏洞源于UDR服务中创建或更新流量影响订阅的处理程序在验证失败后未正确返回，导致继续执行并创建或覆盖订阅，未经身份验证的攻击者可通过访问5G服务接口创建或覆盖包含攻击者控制通知URI和任意SUPI的流量影响订阅。

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