Logto Server-Side Request Forgery via OIDC SSO Connector Issuer URL

Advisories

Logto Server-Side Request Forgery via OIDC SSO Connector Issuer URL

severity: high
date: 8/28/2026
Affecting: logto <= 1.42.0
CVE: CVE-2026-82263
CWE: CWE-918 Server-Side Request Forgery (SSRF)
CVSS: 8.2
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
References: GitHub Issue #9465
https://github.com/logto-io/logto
Vulnerable code: utils.ts
Fix commit
Credit: George Chen
Description: Logto through 1.42.0 contains a server-side request forgery vulnerability in the OIDC SSO connector creation endpoint that fails to validate the issuer URL parameter. Tenant administrators with Management API credentials can supply arbitrary internal URLs to trigger HTTP GET requests to private network services, with response content returned in API responses.

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