CVE-2026-63188 json
logto-tunnel serves files outside --experience-path via path traversal
published 2026-08-19 2 mo ago modified 2026-11-05 3 d ago also GHSA-rxjr-6c9q-h67x , EUVD-2026-62867
- cvss
- 8.7
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 45%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- npm @logto/tunnel 0.3.9
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.54% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.7 | 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 |
| CNA | 4.0 | 8.7 | 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 |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | @logto/tunnel | <0.3.9 |
0.3.9 |
Affected products
- logto-io logto
Classification
- Weakness
-
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory
References
-
github.com
/logto-io/logto/pull/9113
web
-
github.com
/logto-io/logto/commit/5686815955534f803d3d50738259efd0f741e62c
web
-
github.com
/logto-io/logto/security/advisories/GHSA-rxjr-6c9q-h67x
web
-
github.com
/logto-io/logto/releases/tag/@logto/tunnel@0.3.9
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-63188
advisory
-
github.com
/logto-io/logto
package
Sources
- CVE List CVE-2026-63188
- GitHub Advisory GHSA-rxjr-6c9q-h67x
- NVD CVE-2026-63188
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