What’s Vulnerable › Vulnerabilities

CVE-2025-34064: OneLogin AD Connector Log S3 Bucket Hijack Leading to Cross-Tenant Data Leakage

• Severity: critical (CVSS 9.0 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-07-01 · updated 2026-06-17
• Weakness: CWE-200

Description

A cloud infrastructure misconfiguration in OneLogin AD Connector results in log data being sent to a hardcoded S3 bucket (onelogin-adc-logs-production) without validating bucket ownership. An attacker who registers this unclaimed bucket can begin receiving log files from other OneLogin tenants. These logs may contain sensitive data such as directory tokens, user metadata, and environment configuration. This enables cross-tenant leakage of secrets, potentially allowing JWT signing key recovery and user impersonation.

Affected products

• One Identity OneLogin Active Directory Connector (ADC): before 6.1.5 — fixed in 6.1.5

How to fix

Upgrade to a fixed version: One Identity OneLogin Active Directory Connector (ADC) 6.1.5. Check the vendor advisory for mitigations.

References

• https://specterops.io/blog/2025/06/10/onelogin-many-issues-how-i-pivoted-from-a-trial-tenant-to-compromising-customer-signing-keys/
• https://support.onelogin.com/product-notification/noti-00001768
• https://vulncheck.com/advisories/onelogin-ad-connector-account-compromise

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