FastChat contains an authentication bypass vulnerability in the /register_worker endpoint that allows unauthenticated attackers to register arbitrary worker addresses and perform server-side request forgery. Attackers can register malicious workers under victim model names to intercept user prompts, images, and responses, or probe internal network ports across the worker mesh.
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Workaround
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References
History
Fri, 04 Sep 2026 14:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | FastChat contains an authentication bypass vulnerability in the /register_worker endpoint that allows unauthenticated attackers to register arbitrary worker addresses and perform server-side request forgery. Attackers can register malicious workers under victim model names to intercept user prompts, images, and responses, or probe internal network ports across the worker mesh. | |
| Title | FastChat Unauthenticated Worker Registration SSRF and Model Spoofing | |
| Weaknesses | CWE-306 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-09-04T15:05:18.305Z
Reserved: 2026-09-04T13:51:51.902Z
Link: CVE-2026-85695
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Status : Received
Published: 2026-09-04T15:17:47.690
Modified: 2026-09-04T15:17:47.690
Link: CVE-2026-85695
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OpenCVE Enrichment
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Weaknesses