What’s Vulnerable › Vulnerabilities

CVE-2026-71416: Headroom vulnerable to Cross-Site WebSocket Hijacking (CSWSH)

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-11 · updated 2026-09-30
• Weakness: CWE-287

Description

Headroom compresses data before the data reaches a large language model. Prior to version 0.35.0, the Headroom WebSocket server does not validate the `Origin` header of incoming client WebSocket requests before forwarding the request to the upstream server, allowing malicious WebSocket clients to perform arbitrary LLM requests without authentication. This can be exploited by a malicious WebSocket client executed in a traditional or headless browser such as lightpanda, if the browser has access to the Headroom proxy and the OpenAI API key is stored in the `OPENAI_API_KEY` environment variable. Version 0.35.0 fixes the issue.

Affected products

• headroomlabs-ai headroom: before 0.35.0

References

• https://github.com/headroomlabs-ai/headroom/releases/tag/v0.35.0
• https://github.com/headroomlabs-ai/headroom/security/advisories/GHSA-h46j-26q3-rggf
• https://github.com/headroomlabs-ai/headroom/security/advisories/GHSA-h46j-26q3-rggf

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