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Security: Internal exception messages are returned to clients#4634

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tomaioo wants to merge 1 commit into
nextcloud:mainfrom
tomaioo:fix/security/internal-exception-messages-are-returned
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Security: Internal exception messages are returned to clients#4634
tomaioo wants to merge 1 commit into
nextcloud:mainfrom
tomaioo:fix/security/internal-exception-messages-are-returned

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@tomaioo
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@tomaioo tomaioo commented Apr 24, 2026

Summary

Security: Internal exception messages are returned to clients

Problem

Severity: Low | File: lib/Controller/BaseController.php:L47

The base controller returns raw exception messages in HTTP responses (['message' => $e->getMessage()]). If exception text contains internal details (query context, identifiers, stack-related hints), this can expose sensitive implementation information to attackers.

Solution

Return generic user-facing error messages and log detailed exception information server-side only. Map known exceptions to stable, sanitized error codes/messages.

Changes

  • lib/Controller/BaseController.php (modified)

The base controller returns raw exception messages in HTTP responses (`['message' => $e->getMessage()]`). If exception text contains internal details (query context, identifiers, stack-related hints), this can expose sensitive implementation information to attackers.

Signed-off-by: tomaioo <203048277+tomaioo@users.noreply.github.com>
@dartcafe
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Which messages would you classify as dangerous?

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github-actions Bot commented May 9, 2026

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