CVE-2026-55375Network attack vectorHinoki check available

Credential theft via OAuth secrets in request URLs

Published Sep 15, 2026 · Updated Sep 15, 2026

Information disclosure in Canto SaaS API 2.0.0 and earlier allows attackers with telemetry access to obtain OAuth credentials. OAuth2Request::getQueryParams() puts app_id, app_secret, refresh_token, and code in token-request query strings, while OAuth2::obtainAccessToken() rethrows failed request URIs without masking those values. Access to server, proxy, APM, or application-error telemetry exposes credentials that can be exchanged for tenant access tokens.

CVSS severity5.3
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Information disclosure in Canto SaaS API 2.0.0 and earlier allows attackers with telemetry access to obtain OAuth credentials. OAuth2Request::getQueryParams() puts app_id, app_secret, refresh_token, and code in token-request query strings, while OAuth2::obtainAccessToken() rethrows failed request URIs without masking those values. Access to server, proxy, APM, or application-error telemetry exposes credentials that can be exchanged for tenant access tokens.

The record

CVE
CVE-2026-55375
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
jleehr
Product
Canto SaaS API
Classifications
CWE-209, CWE-598, T1552.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

jleehr · Canto SaaS APIversion=< 3.0.0

Published CVSS scores

5.3GitHubCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-209Generation of Error Message Containing Sensitive Information
CWE-598Use of GET Request Method With Sensitive Query Strings
T1552.001Credentials In Files

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo