Blossom
CVE-2026-2623
LOW
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V5 - File Handling Path canonicalization, traversal prevention
MITRE ATT&CK
2 techniques across 2 tactics: Discovery, Collection The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS 6.3 (MEDIUM). Attack vector: Network. Complexity: Low. Privileges required: Low. User interaction: None. Exploitable via remote/network. Public exploit/POC available. |
| Exploit ScenarioDerived | A remote attacker could exploit this vulnerability to compromise the affected system. |
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Alert meAnalysisAIv1 – Mar 12, 2026
Path traversal in Blossom up to version 1.17.1 file upload functionality allows authenticated remote attackers to access arbitrary files on affected systems. Public exploit code exists for this vulnerability, and no patch is currently available from the vendor despite early notification.
Earlier versions of this analysis (1)
A flaw has been found in Blossom up to 1.17.1. This issue affects the function put of the file blossom-backend/common/common-iaas/src/main/java/com/blossom/common/iaas/blos/BLOSManager.java of the component File Upload. [CVSS 6.3 MEDIUM]
RemediationAI
Monitor vendor advisories for a patch. Validate and sanitize file path inputs. Use allowlists. Restrict network access to the affected service where possible.
Affects your stack
Find out whether the stacks and servers you run are on an affected version.
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
Classified as CWE-22 (Path Traversal). Affects Blossom. A flaw has been found in Blossom up to 1.17.1. This issue affects the function put of the file blossom-backend/common/common-iaas/src/main/java/com/blossom/common/iaas/blos/BLOSManager.java of the component File Upload. This manipulation causes path traversal. The attack may be initiated remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
4DescriptionCVE.org
A flaw has been found in Blossom up to 1.17.1. This issue affects the function put of the file blossom-backend/common/common-iaas/src/main/java/com/blossom/common/iaas/blos/BLOSManager.java of the component File Upload. This manipulation causes path traversal. The attack may be initiated remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Executive ViewAI
Organizations using Blossom should be aware of moderate risk from CVE-2026-2623, a path traversal vulnerability rated CVSS 6.3. This could allow unauthorized file access. Proof-of-concept code is publicly available. Organizations should apply vendor updates when available and monitor for exploitation.
Apply vendor patch. If patching is delayed: restrict file access via WAF, implement allowlists.
Threat Intelligence Overview
NVD
CVE.org
EPSS
VulDB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Path traversal exploits occur when applications use user-controlled input to construct file system paths without proper validation.
Malicious file upload attacks exploit insufficient validation when web applications accept user-provided files.
Affected Products (CPE)CVE.org
A vulnerability was detected in Blossom up to 1.17.1. This vulnerability affects the function content of the file blosso
An authenticated authorization bypass (IDOR) in Blossom through 1.17.1 lets any registered user act on folders belonging
Blossom through 1.17.1 fails to verify picture ownership on its picture delete, /picture/del/batch and /picture/star end
GitHub PoC
Exploit-DB