Auth bypass in Blossom-Editor Blossom
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.
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:N/I:L/A:L.
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/214 (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-picture-idor-cross-user-delete (third-party-advisory)
- github.com/blossom-editor/blossom (product)
- www.vulncheck.com/advisories/blossom-through-1.17.1-authorization-bypass-via-pi… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-119644?
- CVE-2026-119644 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-2026-119644?
- Medium severity. CVSS v3 base score is 5.4 out of 10.