CVE-2026-70856 Auth bypass in Siebel CRM Deployment

High 7.5 Published 18 Aug 2026 Updated 20 Aug 2026

Unauthenticated attackers can compromise Siebel CRM Deployment via HTTP, leading to full system takeover, requiring user interaction.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-70856?

CVE-2026-70856 is a high-severity authentication bypass vulnerability in Oracle Siebel Crm, published on 18 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Vulnerability in the Siebel CRM Deployment product of Oracle Siebel CRM (component: Migration). Supported versions that are affected are 17.0-26.6. Difficult to exploit vulnerability allows unauthenticated attacker with network access via HTTP to compromise Siebel CRM Deployment. Successful attacks require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in takeover of Siebel CRM Deployment. CVSS 3.1 Base Score 7.5 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H).

Weakness: CWE-284

Which versions are affected by CVE-2026-70856?

It affects 1 product.

Products include Oracle Siebel Crm.

How do I fix CVE-2026-70856?

No fix has been published for CVE-2026-70856 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2026-70856 being exploited?

There is no known exploitation of CVE-2026-70856 in the wild and no public exploit code.

All Oracle Siebel Crm vulnerabilities

Sources

Also known as GHSA-4j8r-q362-mjw7.