Compliance Impact

The vulnerability allows unauthenticated attackers to make arbitrary outbound requests from LobeHub's infrastructure and inject cookies on the lobehub.com domain, potentially leading to session fixation and session hijacking.

Such unauthorized access and manipulation of user sessions could result in unauthorized access to personal data, which may impact compliance with data protection regulations like GDPR and HIPAA that require strict controls over user data confidentiality and integrity.

Additionally, using LobeHub's infrastructure as an anonymous proxy for scanning, phishing, or abusing IP-based trust relationships could further expose the system to misuse, increasing the risk of data breaches or unauthorized data processing.

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Executive Summary

CVE-2026-54157 is a Server-Side Request Forgery (SSRF) vulnerability in the `/webapi/proxy` endpoint of the LobeHub application (app.lobehub.com). This endpoint accepts a URL in the POST body and fetches it server-side without requiring any authentication.

Because the `/webapi/proxy` route does not enforce authentication checks, an attacker can send arbitrary outbound HTTP requests from LobeHub's infrastructure.

Exploitation can lead to leaking internal deployment details such as Vercel serverless function IP addresses, injecting malicious cookies on the lobehub.com domain via reflected Set-Cookie headers, and using LobeHub's infrastructure as an anonymous proxy.

The vulnerability can also be chained with Cross-Site Request Forgery (CSRF) attacks to set cookies in a victim's browser without their interaction, potentially enabling session hijacking.

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Impact Analysis

This vulnerability can have several impacts:

• Attackers can make arbitrary outbound requests from LobeHub's servers, potentially abusing the infrastructure for scanning, phishing, or bypassing IP-based trust restrictions.
• Leakage of internal deployment details such as Vercel server IPs could aid attackers in further targeting the infrastructure.
• Injection of malicious cookies on the lobehub.com domain can lead to session fixation attacks, especially if LobeHub uses Clerk for authentication.
• Chaining this vulnerability with CSRF attacks can allow attackers to hijack user sessions by setting cookies in victims' browsers without their consent.
• Use of LobeHub's infrastructure as an anonymous proxy can facilitate malicious activities such as phishing or scanning third-party services.

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Detection Guidance

This vulnerability can be detected by monitoring for unauthorized POST requests to the `/webapi/proxy` endpoint on app.lobehub.com that include arbitrary URLs in the request body. Such requests indicate attempts to exploit the SSRF vulnerability.

You can use network monitoring tools or web server logs to identify these suspicious POST requests.

Example commands to detect such activity include:

• Using curl to test the endpoint manually: `curl -X POST https://app.lobehub.com/webapi/proxy -d '{"url":"http://example.com"}' -H 'Content-Type: application/json'`
• Using grep on server logs to find POST requests to the proxy endpoint: `grep 'POST /webapi/proxy' /var/log/nginx/access.log`
• Using tcpdump or Wireshark to capture outbound requests originating from the server that are unusual or unexpected.

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Mitigation Strategies

Immediate mitigation steps include:

• Apply authentication checks to the `/webapi/proxy` endpoint by adding the `checkAuth()` middleware, ensuring only authorized users can access this route.
• If the proxy endpoint is not essential, consider removing it entirely to eliminate the attack surface.
• Monitor and restrict outbound requests from the server to prevent abuse of the SSRF vulnerability.
• Update the LobeHub application to version 2.1.57 or later, where this vulnerability is fixed.

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