Description

The Spring Boot language server logs the raw value of the https_proxy/HTTPS_PROXY/http_proxy/HTTP_PROXY environment variable at INFO level whenever it creates an outbound HTTP client and no explicit http.proxy workspace setting is configured. Corporate proxy URLs frequently embed Basic-auth credentials in the form http://user:pass@proxy:8080, and the language server writes this value to its log file without any redaction. Since language server log files are often attached to bug reports or are readable by other local users/processes, this can result in disclosure of proxy credentials.

Affected Spring Products and Versions

Spring Tools for Eclipse:

• 5.2.0 and earlier

Spring Tools for VSCode / Cursor / Theia:

• 2.2.0 and earlier

All versions prior to version 5 (no longer supported) are also affected.

Mitigation

Users of affected versions should upgrade to the corresponding fixed version.

Spring Tools for Eclipse:

Spring Tools for VSCode / Cursor / Theia:

No further mitigation steps are necessary.

Workaround for unpatched versions: Avoid embedding credentials directly in https_proxy/http_proxy environment variables; configure proxy authentication separately where possible, and treat language server log files as potentially sensitive before sharing or attaching them to bug reports.

References

• CVSS: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N (3.3, Low)

History

• 2026-07-29: Initial vulnerability report published.