Authorization bypass in Blossom lets users delete other users' pictures
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · Low · Low
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-639.
Summary
Blossom through 1.17.1 has an authorization bypass that lets authenticated non-readonly users change other users' pictures by supplying arbitrary picture ids. An attacker 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, as CWE-639 describes.
Written with Claude Haiku 5.5 from the sources below · 2026-11-05
Description from the CNA
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| blossom-editor | Blossom | up to 1.17.1 | — | No fix listed | CNA |
- Blossom Vendorblossom-editor Affected up to 1.17.1 Fixed in — No fix listed CNA
Remediation
The sources list no fixed version for Blossom.
Written with Claude Haiku 5.5 from the sources below · 2026-11-05
Timeline
- 2026-10-30 Threatist record created from CVE-2026-119644
- 2026-10-30 Alias added: GHSA-24rj-35xh-8w8p
- 2026-11-05 CISA SSVC decision points changed
- 2026-11-05 Priority changed: LOW → MEDIUM
References
Other 4
- https://github.com/blossom-editor/blossom/issues/214
- 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/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
More blossom-editor vulnerabilities
- TI-2026-83133 Blossom Authorization Bypass via Folder Endpoints CVSS 4.0MEDIUM 5.3
Sources
- CVE-2026-119644 · CVE Program
- CVE-2026-119644 · NVD
- FIRST EPSS
- GHSA-24rj-35xh-8w8p · GitHub Advisory Database · CC BY 4.0
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