Executive Summary

CVE-2026-2945 is a Server-Side Request Forgery (SSRF) vulnerability in JeecgBoot version 3.9.0, specifically affecting the /sys/common/uploadImgByHttp endpoint.

The vulnerability occurs because the fileUrl parameter, which is supposed to specify a remote image URL for the server to fetch and save, is not properly validated or restricted.

This allows an attacker to supply arbitrary URLs, including internal network addresses, causing the server to make unauthorized HTTP requests to internal services.

As a result, attackers can bypass network firewalls, retrieve sensitive internal data, and expose it by saving it as accessible static files.

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Impact Analysis

This vulnerability can impact you by allowing attackers to access internal network resources that are normally protected by firewalls.

Attackers can retrieve sensitive information from internal services by forcing the server to make unauthorized requests.

The confidentiality, integrity, and availability of your system can be compromised due to this flaw.

Since the exploit is publicly available and can be launched remotely without local access, the risk of attack is significant.

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by monitoring or testing the /sys/common/uploadImgByHttp endpoint in JeecgBoot 3.9.0 for server-side request forgery attempts involving the fileUrl parameter.'}, {'type': 'paragraph', 'content': 'One way to detect exploitation attempts is to send crafted HTTP requests to the endpoint with various fileUrl values pointing to internal or external resources and observe if the server fetches these URLs.'}, {'type': 'paragraph', 'content': 'Example command using curl to test the vulnerability:'}, {'type': 'list_item', 'content': 'curl -X POST https://target-server/sys/common/uploadImgByHttp -H "Content-Type: application/json" -d \'{"fileUrl":"http://127.0.0.1:8000"}\''}, {'type': 'paragraph', 'content': 'If the server responds by fetching or saving the content from the specified URL, it indicates the presence of the SSRF vulnerability.'}, {'type': 'paragraph', 'content': 'Additionally, network monitoring tools can be used to detect unusual outbound HTTP requests from the server to internal IP addresses or unexpected destinations.'}] [1, 2]

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Mitigation Strategies

Immediate mitigation steps include restricting or disabling the vulnerable /sys/common/uploadImgByHttp endpoint in JeecgBoot 3.9.0 to prevent exploitation.

Since no official vendor response or patch is available, consider replacing the affected component with an alternative product that does not contain this vulnerability.

Implement network-level controls such as firewall rules to block unauthorized outbound HTTP requests from the server to internal or sensitive network addresses.

Monitor server logs and network traffic for suspicious activity related to the fileUrl parameter or unexpected HTTP requests.

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