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

Quick assessment

Affected
jleehr canto-saas-api
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

以下是该漏洞描述的中文翻译： canto-saas-api 是一个用于与 Canto SaaS API 交互的 PHP 库。在 3.0.0 版本之前， 方法会将 、 、 和 放入令牌 POST 请求的 URL 查询字符串中，这会导致访问日志、代理日志和 APM（应用性能监控）跟踪记录中以明文形式持久化存储这些凭据。当令牌请求失败时， 还会将携带凭据的 Guzzle 请求 URI 传入 ，使得应用程序日志和错误跟踪器能够记录相同的机密信息。拥有相关遥测数据（telemetry）访问权限的攻击者可以获取 Canto 的

CVSS 5.3 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
jleehr canto-saas-api < 3.0.0 affected
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I. Basic Information for CVE-2026-55375

Vulnerability Information
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Vulnerability Title
canto-saas-api: OAuth credentials exposed in URL query string and exception messages
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过错误消息导致的信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
jleehr canto-saas-api < 3.0.0 -

II. Public POCs for CVE-2026-55375

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III. Intelligence Information for CVE-2026-55375

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Vendor Advisories for CVE-2026-55375 (1)

Vendor Pages for CVE-2026-55375 (1)

IV. Related Vulnerabilities

Same product: canto-saas-api
Same vendor: jleehr
Same weakness: CWE-209

V. Comments for CVE-2026-55375

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