---
id: CVE-2026-55375
title: canto-saas-api is a PHP library for interacting with the Canto SaaS API
summary: >-
  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 …
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-209
  - CWE-598
vendor: jleehr
product: canto-saas-api
affected:
  - canto-saas-api < 3.0.0
patched:
  - jleehr/canto-saas-api 3.0.0
published: '2026-09-15'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T19:17:22.323'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55375'
references:
  - url: >-
      https://github.com/jleehr/canto-saas-api/commit/300559fdae5d1bed2dc00a6477f5996833a77339
    label: security-advisories@github.com
  - url: 'https://github.com/jleehr/canto-saas-api/releases/tag/3.0.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/jleehr/canto-saas-api/security/advisories/GHSA-37pm-83g7-r22v
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-37pm-83g7-r22v'
tags:
  - nvd
  - cve.org
  - ghsa
  - composer
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-15T19:05:37.098259Z'
ecosystem: composer
ingestedAt: '2026-06-22T15:59:08.201Z'
epss: 0.00251
epssPercentile: 0.16812
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-55375)

Affected packages:

- `jleehr/canto-saas-api <= 2.0.0`

Patched in:

- `jleehr/canto-saas-api 3.0.0`

Source: https://github.com/advisories/GHSA-37pm-83g7-r22v