S4E just found a high top 10 tcp port service scan
high·Web Vulnerabilities·Updated Aug 13, 2026

CVE-2026-53755 Scanner

CVE-2026-53755 Scanner - Server-Side-Request-Forgery vulnerability in crawl4ai

Est. Time~1 minutes
Scan TypeGroup Scan
Targetsdomain, subdomain, ipv4
CostFree
0
Times Used
by S4E users
0
Assets Scanned
domains & IPs
0
Vulnerabilities Found
confirmed findings
References
CVECVE-2026-53755
8.6
CVSShigh
Exploitable remotely over the internet · no authentication required.

Crawl4AI is an open-source LLM friendly web crawler & scraper. Prior to 0.8.9, the Docker API server applied its SSRF destination check to the crawl target URL only, not to the proxy address. An unauthenticated request could supply a proxy pointing at an internal IP and route the browser through it, reaching internal services and cloud-metadata endpoints, while using a perfectly valid crawl URL. The Docker API is unauthenticated by default. /crawl, /crawl/stream, and /crawl/job accept a browser_config (and crawler_config). The following all feed Chromium's egress and were unchecked: browser_config.proxy_config.server, browser_config.proxy (deprecated field), crawler_config.proxy_config.server, and --proxy-server / --proxy-pac-url / --proxy-bypass-list / --host-resolver-rules flags in browser_config.extra_args. This vulnerability is fixed in 0.8.9.

Attack Vector
Network
Privileges Req.
None
User Interaction
None
Affected
crawl4aiby unclecode
< 0.8.9
Updated Aug 19, 2026View on NVD →
Detail

Crawl4AI is primarily used by organizations that require automated analysis and data collection from various web sources. The tool is beneficial for search engine developers, data analysts, and web developers looking to automate tasks in web environments. It's widely utilized for web scraping and crawling, allowing users to gather large datasets efficiently. This software supports integrations with other analytical tools to enhance data processing capabilities. Many security and development teams employ it within controlled environments to ensure secure data collection practices. Crawl4AI helps reduce manual data fetching and processing, making it a sought-after tool for improving efficiency in data-driven workflows.

Server-Side Request Forgery (SSRF) is a critical vulnerability where an attacker can manipulate the server to make unauthorized requests to services within the network. The vulnerability arises when applications fetch remote resources without correctly sanitizing and verifying input URLs. SSRF can lead to unauthorized access to internal services, potentially disclosing sensitive information or enabling a pivot to other networks. Attackers might exploit it to access administrative endpoints, cloud metadata, or other unintended resources. It is highly dangerous as it effectively turns the affected server into a proxy for the attacker. Without proper remediation, this vulnerability can lead to severe data breaches and network compromise.

Technically, the vulnerability in Crawl4AI arises from insufficient checks on SSRF destination checks within proxy addresses used in browser and crawler configurations. The exploitation can occur when attackers send specially crafted requests that bypass proxy server restrictions, enabling access to internal services. The vulnerable endpoints include configurations used by the tool to define how it interfaces with other web services. The weakness allows for exploitation without authenticating to the service, significantly increasing its severity. Additionally, if the configuration parameters are left unchecked, malicious actors can access cloud metadata and sensitive endpoints. Effective mitigation requires validating input and restricting allowed proxy configurations to trusted networks only.

If malicious actors exploit this SSRF vulnerability in Crawl4AI, they can access sensitive internal endpoints and data. This could result in unauthorized access to administrative panels, exposure of cloud service metadata, and potential data exfiltration. Exploitation may allow attackers to pivot deeper into the network, accessing other critical systems and services. A breach could also enable attackers to deploy further attacks, such as stealing credentials or injecting malicious code into web-facing applications. The potential for loss of data confidentiality and integrity could severely damage an organization's operations, reputation, and trustworthiness.

REFERENCES

Solution Advice
Remediation:
  • Update Crawl4AI to version 0.8.9 or later to ensure SSRF checks are properly implemented and secure.
  • Restrict input data and validate URLs against a whitelist of trusted sources within your network.
  • Configure network firewalls to block unauthorized outgoing requests from web servers.
  • Implement strict access controls and monitoring to detect and block malicious request patterns.
  • Conduct regular security audits to ensure configurations do not expose internal services to external requests.

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