canto-saas-api: OAuth credentials exposed in URL query string and exception messages

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55375
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-15 18:17:24 UTC
Updated2026-09-15 19:17:22 UTC
Descriptioncanto-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.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Problem Types: CWE-209 | CWE-598 | CWE-209 CWE-209: Generation of Error Message Containing Sensitive Information | CWE-598 CWE-598: Use of GET Request Method With Sensitive Query Strings

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Jleehr Canto-saas-api affected < 3.0.0 Not specified

References

ReferenceSourceLinkTags
github.com/jleehr/canto-saas-api/security/advisories/GHSA-37pm-83g7-r22v [email protected] github.com
github.com/jleehr/canto-saas-api/commit/300559fdae5d1bed2dc00a6477f59968... [email protected] github.com
github.com/jleehr/canto-saas-api/releases/tag/3.0.0 [email protected] github.com
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