Description

Blossom through 1.17.1 contains an authorization bypass vulnerability that allows authenticated non-readonly users to modify other users' pictures by supplying arbitrary picture ids. Attackers can call the picture delete, /picture/del/batch, or /picture/star endpoints to permanently delete victims' images and stored files or change their star status.

Related CPE's

Could not find any relations

References

https://github.com/blossom-editor/blossom

https://github.com/blossom-editor/blossom/blob/v1.17.1/blossom-backend/backend/src/main/java/com/blossom/backend/server/picture/PictureController.java#L56-L109

https://github.com/blossom-editor/blossom/blob/v1.17.1/blossom-backend/backend/src/main/java/com/blossom/backend/server/picture/PictureService.java#L222-L232

https://github.com/blossom-editor/blossom/issues/214

https://hackmd.io/@hieuPenguinnn/blossom-picture-idor-cross-user-delete

https://www.vulncheck.com/advisories/blossom-through-1.17.1-authorization-bypass-via-picture-delete-and-star-endpoints

Weaknesses

[email protected]

Primary
CWE-639

CVSS impact metrics

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

5.4 · Medium

Information

Source identifier

[email protected]

Vulnerability status

Deferred

Published

2026-10-30T15:16:47.557Z

5 hours ago

Last modified

2026-10-30T19:23:25.493Z

1 hour ago