Auth bypass in Blossom-Editor Blossom
CVE-2026-119659
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/blossom-editor/blossom/issues/213 (issue-tracking)
- github.com/blossom-editor/blossom/blob/v1.17.1/blossom-backend/backend/src/main… (technical-description)
- github.com/blossom-editor/blossom/blob/v1.17.1/blossom-backend/backend/src/main… (technical-description)
- hackmd.io/@hieuPenguinnn/blossom-folder-idor-cross-user-modify-delete (third-party-advisory)
- github.com/blossom-editor/blossom (product)
- www.vulncheck.com/advisories/blossom-through-1.17.1-authorization-bypass-via-fo… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-119659?
- CVE-2026-119659 is a medium-severity vulnerability in Blossom-Editor Blossom, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 5.4/10. Published 2026-10-30.
- How severe is CVE-2026-119659?
- Medium severity. CVSS v3 base score is 5.4 out of 10.