Cve-2026-27916 — CraftedSignal Threat Feedhttps://feed.craftedsignal.io/tags/cve-2026-27916/Trending threats, MITRE ATT&CK coverage, and detection metadata — refreshed continuously.Hugoenhello@craftedsignal.iohello@craftedsignal.ioWed, 15 Apr 2026 12:00:00 +0000CVE-2026-27916 Use-After-Free in Windows UPnP Device Hosthttps://feed.craftedsignal.io/briefs/2026-04-cve-2026-27916-upnp/Wed, 15 Apr 2026 12:00:00 +0000hello@craftedsignal.iohttps://feed.craftedsignal.io/briefs/2026-04-cve-2026-27916-upnp/CVE-2026-27916 is a use-after-free vulnerability in Windows Universal Plug and Play (UPnP) Device Host that allows an authorized attacker to elevate privileges locally.CVE-2026-27916 is a critical use-after-free vulnerability affecting the Windows Universal Plug and Play (UPnP) Device Host service. This vulnerability allows an attacker with local access to elevate their privileges on the system. The vulnerability exists due to improper memory management within the UPnP service when handling specific network requests or device interactions. Successful exploitation could allow a low-privileged user or process to execute arbitrary code with elevated privileges, potentially leading to full system compromise. While specific exploitation details are not provided in the advisory, the nature of use-after-free vulnerabilities indicates the potential for reliable exploitation. This vulnerability requires local access, suggesting that it is likely part of a multi-stage attack.

Attack Chain

  1. An attacker gains initial access to the target system, potentially through phishing or exploiting another vulnerability.
  2. The attacker identifies that the target system is running the vulnerable Windows UPnP Device Host.
  3. The attacker crafts a malicious UPnP request designed to trigger the use-after-free condition within the UPnP service.
  4. The attacker sends the crafted UPnP request to the vulnerable service, triggering the memory corruption.
  5. The UPnP service attempts to access the freed memory, leading to a crash or, with careful manipulation, code execution.
  6. The attacker exploits the use-after-free vulnerability to overwrite critical system structures in memory.
  7. The attacker leverages the corrupted memory to inject and execute arbitrary code within the context of the UPnP service, which runs with elevated privileges.
  8. The attacker gains elevated privileges on the system, allowing them to perform actions such as installing software, modifying data, and creating new accounts.

Impact

Successful exploitation of CVE-2026-27916 allows a local attacker to elevate privileges to SYSTEM. This could allow a malicious actor to gain complete control over an affected system, potentially leading to data theft, system compromise, and further lateral movement within a network. The vulnerability affects any system running the vulnerable Windows UPnP service. The impact is high due to the potential for full system compromise.

Recommendation

  • Apply the security update released by Microsoft to patch CVE-2026-27916 on all affected Windows systems. Refer to the Microsoft advisory https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27916.
  • Enable process auditing to monitor for unexpected processes being launched by the UPnP service (svchost.exe hosting the upnphost service) to aid in detecting potential exploitation attempts. Implement the “UPnP Device Host Spawning Suspicious Process” Sigma rule below, and tune for your environment.
  • Monitor for suspicious network activity originating from the UPnP service (svchost.exe).
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