sync_sso del servidor rechaza cargas útiles válidas con 422 "Error de inicio de sesión" cuando el base64 contiene un `+` (disparado por `~` en campos sincronizados)

zogstrip · 24 Julio, 2026 14:04

Gracias por el reporte @sweetbeems Se solucionará en

github.com/discourse/discourse

FIX: Preserve "+" in server-side sync_sso payloads (#42024)

main ← fix-sync-sso-plus-double-decode

merged 02:28PM - 24 Jul 26 UTC

ZogStriP

+51 -19

Previously, `sync_sso` rebuilt its query string from the already form-decoded `p…arams[:sso]` and let `DiscourseConnect.parse` decode it a second time, so any literal `+` in the base64 payload became a space and a correctly-signed request was rejected with a generic 422 "Login Error". This change rebuilds the query with `Rack::Utils.build_query` — the exact inverse of the `parse_query` the parser runs — so the payload is decoded exactly once. The second commit applies the same reasoning to `CookedPostProcessor#remove_user_ids`, which rebuilt link query strings by hand and corrupted encoded values (e.g. `%26`) when stripping the `u=` param. Reported at https://meta.discourse.org/t/407426.

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Watch out for double url encoding of SSO payload SSO	0	1567	28 Julio 2019
SSO and e-mail addresses having a plus sign Support	3	2116	14 Abril 2021
Registration email address special characters Support	2	500	16 Agosto 2021
Sso login error when return_sso_url is blank Bug	2	1338	15 Agosto 2016

sync_sso del servidor rechaza cargas útiles válidas con 422 "Error de inicio de sesión" cuando el base64 contiene un `+` (disparado por `~` en campos sincronizados)

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