CVE-2026-85706: Public PoC for Unauthenticated Arbitrary File Read in GitLab CE/EE via Workhorse Routing Bypass

Sensitive credential and configuration disclosure in GitLab Enterprise Edition allows an authenticated user with Duo Chat access to exfiltrate Advanced Search (Elasticsearch) instance configurations and stored credentials by supplying a specially crafted GraphQL subscription argument that bypasses serialization and forces an internal server object lookup. It affects EE 18.3 through 19.1.8, 19.2 through 19.2.6, and 19.3 through 19.3.2, was reported by GitLab, and publicly available exploit code exists (HackerOne #4012289). No CISA KEV listing at time of analysis, so this is POC-backed but not confirmed as actively exploited.