CVE-2026-2623 Blossom File Upload BLOSManager.java put path traversal
Remote attackers can exploit a path traversal flaw in Blossom's file upload manager to read or modify arbitrary files on the server.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-2623?
CVE-2026-2623 is a medium-severity path traversal vulnerability in Blossom, published on 17 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-22
Which versions are affected by CVE-2026-2623?
It affects 1 product.
Products include Wangyunf Blossom.
How do I fix CVE-2026-2623?
No fix has been published for CVE-2026-2623 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-2623 being exploited?
There is no known exploitation of CVE-2026-2623 in the wild and no public exploit code.
Other vulnerabilities in Blossom
Sources
Also known as GHSA-crg7-mqpm-5qr4.