Authenticated code execution via unrestricted attachment upload
Published Aug 21, 2026 · Updated Aug 25, 2026
Unrestricted file upload in xShop 3.0.3 allows remote authenticated users to execute server-side code through an attachment upload. The POST /dashboard/attachments/attaching handler saves the file in a web-accessible directory without checking its extension or MIME type, so a PHP payload can be requested and executed. Administrative access is required; successful exploitation grants the payload the web server process's access to application data and host resources.
Summary
What happened
Unrestricted file upload in xShop 3.0.3 allows remote authenticated users to execute server-side code through an attachment upload. The POST /dashboard/attachments/attaching handler saves the file in a web-accessible directory without checking its extension or MIME type, so a PHP payload can be requested and executed. Administrative access is required; successful exploitation grants the payload the web server process's access to application data and host resources.
The record
- CVE
- CVE-2026-49849
- Published
- Aug 21, 2026
- Updated
- Aug 25, 2026
- Vendor
- 4xmen
- Product
- xShop
- Classifications
- CWE-434, T1505.003
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Aug 21, 2026CVE publishedPublication date reported by the CVE source.
- Aug 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion== 3.0.3
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- GitHub Security Advisory attachment-upload proof of conceptfunctional · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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