CVE-2026-85695
Medium
Elevated severity or exploit probability.
CVSS base
9.4
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
EPSS — probability of exploitation (30 days)
0.7%
51.9th percentile
CISA KEV
Not listed
Weakness / dates
CWE-306
Published 2026-09-04 · modified 2026-09-10
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.