Arbitrary file write via unchecked upload path
Published Aug 26, 2026 · Updated Aug 26, 2026
Arbitrary file upload in DocSys-master 2.02.85 allows remote attackers to write files via unauthenticated multipart requests. The uploadMarkdownPic handler assigns the user-controlled imgName directly to fileName without path validation, creates only the res directory, and writes the supplied MultipartFile at the resulting path. Directory-traversal sequences can place attacker-controlled content anywhere permitted to the service account, including a served web directory where executable content can yield code execution.
Summary
What happened
Arbitrary file upload in DocSys-master 2.02.85 allows remote attackers to write files via unauthenticated multipart requests. The uploadMarkdownPic handler assigns the user-controlled imgName directly to fileName without path validation, creates only the res directory, and writes the supplied MultipartFile at the resulting path. Directory-traversal sequences can place attacker-controlled content anywhere permitted to the service account, including a served web directory where executable content can yield code execution.
The record
- CVE
- CVE-2026-75327
- Published
- Aug 26, 2026
- Updated
- Aug 26, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-434, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 26, 2026CVE publishedPublication date reported by the CVE source.
- Aug 26, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What is affected?
Affected products and versions are unavailable in this record.
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
- DocSys uploadMarkdownPic multipart path-traversal requestproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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