Vulnerability · Published Jul 1, 2025 · Assigned by VulnCheck

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

Critical 9.0

In plain English

A critical-severity information exposure in OneLogin Active Directory Connector (ADC) from One Identity. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities).

Severity (CVSS 4.0)9.0Critical

Exploit odds (30 days)0.5%top 55.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
One Identity	OneLogin Active Directory Connector (ADC)	0 – before 6.1.5

Weakness: CWE-668, CWE-200 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N

References

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