CVE-2026-55375

CVE-2026-55375 · canto-saas-api: OAuth credentials exposed in URL query string and exception messages

This page contains facts from public vulnerability sources. Check the original advisory before updating.

canto-saas-api is a PHP library for interacting with the Canto SaaS API. Prior to version 3.0.0, OAuth2Request::getQueryParams() places app_id, app_secret, refresh_token, and code in the URL query string of token POST requests, allowing access logs, proxy logs, and APM traces to persist the credentials in plaintext. When a token request fails, OAuth2::obtainAccessToken() also passes the credential-bearing Guzzle request URI into AuthorizationFailedException, so application logs and error trackers can record the same secrets. An attacker with access to affected telemetry can obtain Canto credentials and use them to request access tokens for the tenant. This issue is fixed in version 3.0.0.

CVSS 5.3 · Medium · EPSS 0.4% · Fix available

Published

2026-09-15T17:30:29.992Z

Updated

2026-09-15T19:05:49.862Z

Stack: php

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