What is the CVSS score of CVE-2025-34063?

CVE-2025-34063 has a CVSS 4.0 base score of 10.0 (Critical). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H. EPSS exploitation probability: 0.1%.

Which versions of OneLogin AD Connector are affected by CVE-2025-34063?

OneLogin AD Connector versions prior to 6.1.5 expose JWT signing keys through an API endpoint, allowing attackers to forge authentication tokens and impersonate any user across the organization's…. A patch is available.

How to fix or mitigate CVE-2025-34063?

Within 24 hours: Inventory all OneLogin AD Connector deployments and document current versions. Within 7 days: Upgrade all OneLogin AD Connector instances to version 6.1.5 or later; rotate all JWT signing keys and invalidate previously issued tokens through OneLogin administrative console. Within 30 days: Conduct forensic review of OneLogin API access logs (particularly /api/adc/v4/configuration endpoint) for unauthorized key extraction; audit downstream SAML/OIDC applications for suspicious authentication events; implement API rate limiting and IP whitelisting on the affected endpoint.

OneLogin AD Connector CVE-2025-34063

EUVD-2025-19635 CRITICAL

Authentication Bypass by Spoofing (CWE-290)

2025-07-01 disclosure@vulncheck.com

Authentication Bypass

10.0

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

10.0 CRITICAL

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Lifecycle Timeline

Analysis Updated

Apr 16, 2026 - 05:52 EUVD-patch-fix

executive_summary

Re-analysis Queued

Apr 16, 2026 - 05:29 backfill_euvd_patch

patch_released

Patch available

Apr 16, 2026 - 05:29 EUVD

6.1.5

EUVD ID Assigned

Mar 16, 2026 - 01:42 euvd

EUVD-2025-19635

Analysis Generated

Mar 16, 2026 - 01:42 vuln.today

CVE Published

Jul 01, 2025 - 15:15 nvd

CRITICAL 10.0

DescriptionCVE.org

A cryptographic authentication bypass vulnerability exists in OneLogin AD Connector prior to 6.1.5 due to the exposure of a tenant’s SSO JWT signing key via the /api/adc/v4/configuration endpoint. An attacker in possession of the signing key can craft valid JWT tokens impersonating arbitrary users within a OneLogin tenant. The tokens allow authentication to the OneLogin SSO portal and all downstream applications federated via SAML or OIDC. This allows full unauthorized access across the victim’s SaaS environment.

Analysis

Technical ContextAI

An authentication bypass vulnerability allows attackers to circumvent login mechanisms and gain unauthorized access without valid credentials. This vulnerability is classified as Authentication Bypass by Spoofing (CWE-290).

RemediationAI

Implement robust authentication mechanisms. Use multi-factor authentication. Review authentication logic for bypass conditions. Remove default credentials.