CVE-2026-119644

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.

• 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://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

• CRITICALCVE-2024-34323
• MEDIUMCVE-2025-71420PoC
• MEDIUMCVE-2026-100142
• UNSCOREDCVE-2026-100177PoC
• HIGHCVE-2026-100268
• MEDIUMCVE-2026-100272
• HIGHCVE-2026-100514
• HIGHCVE-2026-100517

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