Unauthenticated file disclosure via uncontained request paths
Published Aug 27, 2026 · Updated Aug 27, 2026
Path traversal in the static file handler in blackms aistack 1.6.0 through 1.6.1 allows remote attackers to read server files over HTTP. The serveStatic method joins req.url to web/dist and passes the normalized result to fs.readFileSync without verifying that it remains under the static root. Exploitation requires a reachable web server, a readable target file, and no intermediary that rejects or normalizes the traversal path.
Summary
What happened
Path traversal in the static file handler in blackms aistack 1.6.0 through 1.6.1 allows remote attackers to read server files over HTTP. The serveStatic method joins req.url to web/dist and passes the normalized result to fs.readFileSync without verifying that it remains under the static root. Exploitation requires a reachable web server, a readable target file, and no intermediary that rejects or normalizes the traversal path.
The record
- CVE
- CVE-2026-81560
- Published
- Aug 27, 2026
- Updated
- Aug 27, 2026
- Vendor
- blackms
- Product
- aistack
- Classifications
- CWE-22, T1005
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 27, 2026CVE publishedPublication date reported by the CVE source.
- Aug 27, 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=1.6.0
- Affected versionversion=1.6.1
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
- GitHub issue #57 traversal reproductionfunctional · 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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