How can this vulnerability impact me? :

This vulnerability can impact you by allowing an authenticated attacker to scan and potentially access internal network resources that should be protected from external access. This could lead to unauthorized information disclosure about internal services, network topology, or sensitive data hosted internally.

Such unauthorized internal access can be a stepping stone for further attacks, including lateral movement within the network, exploitation of other vulnerabilities, or data exfiltration.

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Can you explain this vulnerability to me?

CVE-2026-36757 is a Server-Side Request Forgery (SSRF) vulnerability found in Halo version 2.22.14. It specifically affects the /plugins/{name}/upgrade-from-uri endpoint. Authenticated attackers can exploit this flaw by sending crafted GET requests that cause the server to make unauthorized requests to internal network resources.

The vulnerability occurs because the system does not properly validate user-supplied URIs in the DefaultReactiveUrlDataBufferFetcher class, allowing attackers to bypass restrictions on protocols and host validation. This enables attackers to scan or access internal services that are normally not accessible from outside the network.

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How can this vulnerability be detected on my network or system? Can you suggest some commands?

This vulnerability can be detected by monitoring and analyzing HTTP GET requests sent to the /plugins/{name}/upgrade-from-uri endpoint in Halo version 2.22.14. Specifically, look for authenticated requests that include URIs targeting internal network addresses, which should normally be inaccessible externally.

To detect potential exploitation attempts, you can inspect web server logs or use network monitoring tools to identify unusual or unauthorized internal network scanning activities initiated via this endpoint.

Example commands to help detect such activity include:

• Using grep to find suspicious requests in web server logs: grep "/plugins/" access.log | grep "upgrade-from-uri"
• Using curl to test the endpoint with a crafted URI (requires authentication): curl -i -X GET -H "Authorization: Bearer <token>" "https://<halo-server>/plugins/<plugin-name>/upgrade-from-uri?uri=http://internal-ip"
• Using network monitoring tools like tcpdump or Wireshark to capture outgoing HTTP requests from the Halo server to internal IP addresses.

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What immediate steps should I take to mitigate this vulnerability?

The immediate mitigation step is to implement a blacklist or filtering mechanism that prevents the /plugins/{name}/upgrade-from-uri endpoint from making requests to internal IP addresses or unauthorized protocols.

This involves validating and restricting user-supplied URIs to ensure they do not point to internal network resources, thereby blocking SSRF exploitation attempts.

Additionally, ensure that only authenticated and authorized users can access this endpoint, and monitor logs for suspicious activity.

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How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:

The CVE-2026-36757 vulnerability allows authenticated attackers to scan internal resources via SSRF, potentially exposing internal services that are not meant to be accessible externally.

Such unauthorized access to internal network resources could lead to exposure of sensitive data or systems, which may impact compliance with standards and regulations like GDPR or HIPAA that require protection of personal and sensitive information.

However, the provided information does not explicitly detail the direct impact on compliance or specific regulatory violations.

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