CVE-2026-68745 Apache CloudStack: SAML2 Signature Validation Silently Skipped for Cert-less IdP

High 8.1 Published 21 Aug 2026 Updated 24 Aug 2026

Attackers can bypass SAML signature validation to forge authentication responses and gain unauthorized access to the CloudStack management server.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-68745?

CVE-2026-68745 is a high-severity authentication bypass vulnerability in Apache Cloudstack, published on 21 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Certificate validation failures in SAML authentication in Apache CloudStack 4.20.3.0 and 4.22.1.0 on all platforms allow a malicious agent to forge a SAML response to the management server. The agent will have to spoof the ip address of the IdP or get an url of its own choosing registered in the management server, after which it can allow logging on with forged signatures.

Users are recommended to upgrade to versions 4.20.3.1 or 4.22.1.1 and above, which fix this issue.

Weakness: CWE-347

Which versions are affected by CVE-2026-68745?

It affects 1 product.

Products include Apache Cloudstack.

How do I fix CVE-2026-68745?

No fix has been published for CVE-2026-68745 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-2026-68745 being exploited?

There is no known exploitation of CVE-2026-68745 in the wild and no public exploit code.

All Apache Cloudstack vulnerabilities

Sources

Also known as GHSA-g5rw-pw9w-c288.