CVE-2026-87815 [HIGH] – SiYuan versions before v3.8.2 contain a path traversal vulnerability in the /api/riff/remo

SiYuan versions before v3.8.2 contain a path traversal vulnerability in the /api/riff/removeRiffDeck endpoint that fails to validate the deckID parameter. An authenticated administrator can supply path traversal sequences to delete arbitrary .deck and .cards files outside the workspace directory.