Can you explain this vulnerability to me?

CVE-2026-3052 is a Server-Side Request Forgery (SSRF) vulnerability found in DataLinkDC dinky versions up to 1.2.5, specifically in the Flink Proxy Controller component. The vulnerability exists because the proxyUba function accepts arbitrary URLs from authenticated users without proper validation or whitelisting.

This flaw allows attackers to craft HTTP requests that the Dinky server executes, targeting internal network resources, cloud metadata services, localhost services, and other unauthorized endpoints. The attacker can manipulate the input to the proxyUba function to make the server send requests on their behalf.

The vulnerability is remotely exploitable by authenticated users and has a public proof-of-concept exploit available. The vendor was notified but did not respond or provide a fix.

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How can this vulnerability impact me? :

Exploitation of this SSRF vulnerability can lead to several serious impacts on the affected system and infrastructure.

• Credential theft by accessing cloud metadata services (e.g., AWS IAM credentials, GCP service accounts, Azure tokens).
• Internal network reconnaissance by scanning and enumerating internal services, databases, caches, and administrative interfaces.
• Lateral movement within the affected infrastructure by accessing internal APIs and services that are normally protected.
• Compromise of confidentiality due to exposure of sensitive internal resources.

Integrity and availability are not directly affected by this vulnerability.

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

I don't know

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

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by monitoring and analyzing proxy requests made to the Flink Proxy Controller, specifically looking for unusual or unauthorized HTTP requests initiated by the proxyUba function. Detection involves logging all proxy requests with user identity, target URL, timestamp, and response status, and generating alerts on requests to internal IP ranges, cloud metadata endpoints, failed proxy attempts, and access to non-Flink endpoints.'}, {'type': 'paragraph', 'content': 'To detect exploitation attempts on your system or network, you can look for HTTP requests to internal or sensitive IP addresses such as 169.254.169.254 (cloud metadata service), localhost (127.0.0.1), and private network ranges (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) that are proxied through the vulnerable endpoint.'}, {'type': 'paragraph', 'content': 'Suggested commands include using network monitoring tools or web server access logs to filter requests matching the vulnerable proxy path pattern, for example:'}, {'type': 'list_item', 'content': 'Using grep on web server logs to find suspicious proxy requests: grep "/api/flink/http" /var/log/dinky/access.log'}, {'type': 'list_item', 'content': 'Using curl or similar tools to test if the proxy endpoint is accessible and vulnerable: curl -i -H "Cookie: valid_session_cookie" "http://dinky-server/api/flink/http://169.254.169.254/latest/meta-data/"'}, {'type': 'list_item', 'content': 'Using network monitoring tools like tcpdump or Wireshark to capture and analyze outgoing HTTP requests from the Dinky server to internal IP ranges.'}] [3]

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What immediate steps should I take to mitigate this vulnerability?

Immediate mitigation steps include implementing strict controls to prevent exploitation of the SSRF vulnerability in the Flink Proxy Controller:

• Implement a strict URL whitelist restricting proxy targets to predefined trusted Flink cluster endpoints, ensuring that only relative paths without URL schemes are accepted.
• Add network-level controls such as firewall rules on the Dinky server to block access to sensitive IP ranges including cloud metadata IP (169.254.169.254), loopback addresses (127.0.0.0/8), private networks (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16), and link-local addresses (169.254.0.0/16).
• Strengthen authorization by replacing generic login checks with role-based access control annotations to restrict proxy usage to authorized roles and enable auditing.
• Implement monitoring and alerting by logging all proxy requests with user identity, target URL, timestamp, and response status, and generate alerts on suspicious requests.

Since no official patch or fix has been released and the vendor has not responded, users are advised to consider replacing the affected product with alternatives if possible.

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