Medium severity5.4NVD Advisory· Published Oct 30, 2026

CVE-2026-119659

Description

Blossom through 1.17.1 contains an authorization bypass vulnerability that allows authenticated users to access other users' folders because FolderService queries filter only on folder id. Attackers can supply another user's folder id to /folder/info, /folder/upd, /folder/open or /folder/del to read storage paths, rename, toggle visibility, or delete folders.

Patches

Vulnerability mechanics

References

github.com/blossom-editor/blossom/blob/v1.17.1/blossom-backend/backend/src/main/java/com/blossom/backend/server/folder/FolderService.javanvd
github.com/blossom-editor/blossom/blob/v1.17.1/blossom-backend/backend/src/main/resources/mapper/FolderMapper.xmlnvd
github.com/blossom-editor/blossom/issues/213nvd
hackmd.io/@hieuPenguinnn/blossom-folder-idor-cross-user-modify-deletenvd
www.vulncheck.com/advisories/blossom-through-1.17.1-authorization-bypass-via-folder-endpointsnvd

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