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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 是现代的、开源的身份认证基础设施，适用于 SaaS 和 AI 应用。在版本 0.3.9 之前，Logto Tunnel npm 包存在安全漏洞。具体而言，在 中的 函数处理静态资源请求时，从 获取请求路径，并通过 中的 拼接文件路径，随后使用 打开该文件。此过程未对 URL 进行规范化处理，也未实施路径遍历防护（如目录包含性检查）。 当启用 选项且隧道端口对外可访问时，未经验证的用户可通过构造包含 的路径向 发起请求，从而读取配置静态目录之外、但可被 进程读取的文件。此外，该服务使用 监听端口，根据运行

CVSS 8.7 · High EPSS 0.44% · P37

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

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
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Qwen3.6-35B-A3B · 12119 chars
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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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