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CVE-2026-63188— logto-tunnel serves files outside --experience-path via path traversal

Quick assessment

Affected
logto-io logto
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

logto-io logto是logto-io组织的一个身份认证和用户管理平台。 logto-io logto 0.3.9之前版本存在路径遍历漏洞，该漏洞源于对静态文件请求URL未进行规范化处理或包含检查，可能导致未经身份验证的攻击者通过发送包含../的路径遍历读取静态目录之外的可读文件。

CVSS 8.7 · High EPSS 0.54% · P44

Affected Version Matrix 1

VendorProduct Version RangeStatus
logto-io logto < 0.3.9 affected
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I. Basic Information for CVE-2026-63188

Vulnerability Information
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Vulnerability Title
logto-tunnel serves files outside --experience-path via path traversal
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
logto-io logto 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
logto-io logto是logto-io组织的一个身份认证和用户管理平台。 logto-io logto 0.3.9之前版本存在路径遍历漏洞，该漏洞源于对静态文件请求URL未进行规范化处理或包含检查，可能导致未经身份验证的攻击者通过发送包含../的路径遍历读取静态目录之外的可读文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
logto-io logto < 0.3.9 -

II. Public POCs for CVE-2026-63188

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: path traversal served /opt/secret.txt (PROOF_b3a2a3b4ced2308d) — static file proxy escaped the experience path
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
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claude_code · 12119 chars
GitHub 复现环境（可 clone 直接跑）
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III. Intelligence Information for CVE-2026-63188

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Patches & Fixes for CVE-2026-63188 (2)

Vendor Advisories for CVE-2026-63188 (1)

Other References for CVE-2026-63188 (1)

Same Patch Batch · logto-io · 2026-08-19 · 3 CVEs total

CVE-2026-62317 7.5 HIGH Logto: ReDoS via unescaped user input in email subaddressing regex (blockSubaddressing)
CVE-2026-63187 6.3 MEDIUM Logto: OS command injection vulnerability exists in the Commitlint workflow

IV. Related Vulnerabilities

Same product: logto
Same vendor: logto-io
Same weakness: CWE-22

V. Comments for CVE-2026-63188

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