EUVD-2026-67322
GHSA-hxm6-p6gf-5748
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Network vector applies when dev server is exposed on a network interface; no authentication required; read-only impact limits integrity and availability to N.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Lifecycle Timeline
2DescriptionCVE.org
A path traversal vulnerability exists in the built-in preview/development web server of Lektor <3.3.14 on Windows. An attacker with network access to the server can send a crafted HTTP request containing path traversal sequences to read arbitrary files accessible to the process, disclosing sensitive information such as system files and deployment configuration files containing credentials.
AnalysisAI
Path traversal in Lektor's built-in preview and development HTTP server on Windows exposes arbitrary files to unauthenticated network attackers in all versions prior to 3.3.14. Crafted HTTP requests containing path traversal sequences exploit Windows-specific path separator handling to escape the configured web root and read any file accessible to the Lektor process, including system files and deployment configuration files that may contain credentials. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The Lektor development or preview HTTP server must be running on a Windows host and must be bound to a network-accessible interface (i.e., not restricted to 127.0.0.1/localhost). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.5 (High) score with AV:N/AC:L/PR:N/UI:N accurately reflects the technical severity when the Lektor development server is exposed on a network-accessible interface - no authentication is required and exploitation is low-complexity. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade Lektor to version 3.3.14 or later, which resolves the path traversal vulnerability in the Windows development server; the fix is available via the Lektor GitHub repository at https://github.com/lektor/lektor. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: immediately disable Lektor's preview server when not actively in use and configure it to listen only on localhost (127.0.0.1) rather than network interfaces; isolate development systems running Lektor from network access where possible. …
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External POC / Exploit Code
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