File existence and size disclosure via path traversal
Published Aug 13, 2026 · Updated Aug 18, 2026
Path traversal in Dromara lamp-cloud 5.0 through 5.10.0 allows remote attackers to disclose file existence and exact size via chunk-check. FileChunkController joins the unvalidated name field beneath uploadFolder, and WebUploader tests isFile() and compares target.length() with an attacker-supplied size. The deprecated and hidden endpoint remains remotely mapped without URI-level authorization, creating a boolean oracle for any file the service account can stat.
Summary
What happened
Path traversal in Dromara lamp-cloud 5.0 through 5.10.0 allows remote attackers to disclose file existence and exact size via chunk-check. FileChunkController joins the unvalidated name field beneath uploadFolder, and WebUploader tests isFile() and compares target.length() with an attacker-supplied size. The deprecated and hidden endpoint remains remotely mapped without URI-level authorization, creating a boolean oracle for any file the service account can stat.
The record
- CVE
- CVE-2026-19758
- Published
- Aug 13, 2026
- Updated
- Aug 18, 2026
- Vendor
- Dromara
- Product
- lamp-cloud
- Classifications
- CWE-22, T1083, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 13, 2026CVE publishedPublication date reported by the CVE source.
- Aug 18, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=5.0
- Affected versionversion=5.1
- Affected versionversion=5.10.0
- Affected versionversion=5.2
- Affected versionversion=5.3
- Affected versionversion=5.4
- Affected versionversion=5.5
- Affected versionversion=5.6
- Affected versionversion=5.7
- Affected versionversion=5.8
- Affected versionversion=5.9
What conditions does exploitation require?
What is affected?
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
- Chunk-check path-traversal request proof of conceptproof of concept · unverified
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo