CVE-2026-63188Public exploitNetwork attack vector

Arbitrary file read via path traversal

Published Aug 19, 2026 · Updated Aug 19, 2026

Path traversal in the Logto Tunnel npm package before 0.3.9 allows remote attackers to read local files via crafted asset paths. The createStaticFileProxy flow in packages/tunnel/src/commands/tunnel/utils.ts joins request.url to --experience-path and opens the result without decoding, normalizing, or verifying that the resolved path stays under the configured static root. Exposure requires --experience-path to be enabled and the tunnel port to be reachable; successful requests disclose any file readable by the logto-tunnel process, with published impact limited to read-only access.

CVSS severity8.7
High
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in the Logto Tunnel npm package before 0.3.9 allows remote attackers to read local files via crafted asset paths. The createStaticFileProxy flow in packages/tunnel/src/commands/tunnel/utils.ts joins request.url to --experience-path and opens the result without decoding, normalizing, or verifying that the resolved path stays under the configured static root. Exposure requires --experience-path to be enabled and the tunnel port to be reachable; successful requests disclose any file readable by the logto-tunnel process, with published impact limited to read-only access.

The record

CVE
CVE-2026-63188
Published
Aug 19, 2026
Updated
Aug 19, 2026
Vendor
Logto
Product
Logto
Classifications
CWE-22, T1005, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 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.

  1. Affected versionversion=< 0.3.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Logto · Logtoversion=< 0.3.9

Published CVSS scores

8.7GitHub, Inc.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

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1005Data from Local System
T1190Exploit Public-Facing Application

Public exploit references

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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