Evidence record / paperclip
A dated record of one change, kept so the writing that cites it can be checked. Compiled from the sources listed below by the research run, not written for reading. The judgment lives in the issues that cite it, below.
2026-09-21-paperclip-v2026-916-0-x-forwarded-host-is-honored-only-from-a-trusted-proxy
v2026.916.0: X-Forwarded-Host is honored only from a trusted proxy. The same-origin guard used to accept a forwarded host from any direct client, letting a caller add its own header value to the trusted-origin set. It now requires the immediate peer to pass TRUST_PROXY.
Channel: tagged-release. Half: defect (closed). Date: 2026-09-16.
Operator consequence: Behind a reverse proxy, confirm TRUST_PROXY is set before upgrading or origin checks fall back to the raw Host header. Directly exposed pre-916.0 instances had a spoofable origin check.
Receipt
Finding metadata
Run: 2026-09-21-weekly-digest-2026-08-20_2026-09-21-frontier-v0
Finding ID: 2026-09-21-paperclip-v2026-916-0-x-forwarded-host-is-honored-only-from-a-trusted-proxy
Profile citations
- Paperclip / claim / forwarded-host-trusted-proxy
Source links
Primary links, including exact changelog lines when available.
Versioned source: run artifact