EUVD-2026-62867
GHSA-rxjr-6c9q-h67x
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable unauthenticated read with no user interaction; confidentiality-only impact, no integrity or availability effect.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
4DescriptionCVE.org
Logto is the modern, open-source auth infrastructure for SaaS and AI apps. Prior to 0.3.9, the Logto Tunnel npm package enabled createStaticFileProxy from packages/tunnel/src/commands/tunnel/index.ts and passed request.url from static asset requests through packages/tunnel/src/commands/tunnel/utils.ts using path.join(staticPath, request.url) and then fs.open(requestPath, "r") without URL normalization or a containment check. When --experience-path was enabled and the tunnel port was reachable, an unauthenticated requester could send a path containing ../ to createStaticFileProxy and read files outside the configured static directory that were readable by the logto-tunnel process. The service used server.listen(port), which could expose the tunnel to other hosts depending on the platform and deployment. This issue is fixed in version 0.3.9.
Articles & Coverage 1
AnalysisAI
Path traversal in @logto/tunnel (versions <= 0.3.8) exposes arbitrary file read to any network peer that can reach the tunnel port when the --experience-path flag is active. The Node.js static file proxy passes request.url directly into path.join(staticPath, request.url) followed by fs.open without URL normalization or containment checks, allowing ../ sequences to escape the configured static directory. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Two specific conditions must both be true for exploitation: (1) The Logto Tunnel CLI must be invoked with the --experience-path flag set to a local directory - without this flag, createStaticFileProxy is never registered and the vulnerable code path is unreachable; and (2) The tunnel port must be network-accessible from the attacker's location - because server.listen(port) binds to all interfaces on most platforms, any host that can route to the port qualifies. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:H) is internally consistent with the description: once the preconditions are met the attack is trivially executable with a single HTTP request and no credentials. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker identifies a host running logto-tunnel with --experience-path enabled and the tunnel port accessible over the network. They send a crafted HTTP GET request such as GET /../../../home/runner/.env HTTP/1.1 to the tunnel port; the server resolves the path outside the static directory and returns the file contents directly in the HTTP response body. … |
| Remediation | Upgrade @logto/tunnel to version 0.3.9 or later using npm install @logto/tunnel@0.3.9 or by updating the version constraint in package.json and running npm install. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all systems running @logto/tunnel versions 0.3.8 or earlier by querying deployment inventories and package registries. …
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Same weakness CWE-22 – Path Traversal
View allSame technique Path Traversal
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External POC / Exploit Code
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