CVE-2026-9311 IBM WebSphere Application Server is affected by remote code execution

What is CVE-2026-9311?

CVE-2026-9311 is a critical code injection vulnerability in Ibm Websphere Application Server, published on 1 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

IBM WebSphere Application Server 9.0, and 8.5 is vulnerable to remote code execution caused by the bypass of security controls.

Weakness: CWE-94

Which versions are affected by CVE-2026-9311?

It affects 1 product.

Products include Ibm Websphere Application Server.

How do I fix CVE-2026-9311?

No fix has been published for CVE-2026-9311 yet. Limit exposure of the affected software until one is available.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2026-9311 being exploited?

There is no known exploitation of CVE-2026-9311 in the wild and no public exploit code.

Other vulnerabilities in Ibm Websphere Application Server

• CVE-2015-1920 Code injection in n/a Critical 10.0
• CVE-2013-0462 Other in n/a Critical 10.0
• CVE-2011-1377 Security feature bypass in n/a Critical 10.0
• CVE-2010-3186 Other in n/a Critical 10.0
• CVE-2009-1899 Information disclosure in n/a Critical 10.0

All Ibm Websphere Application Server vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-gfh5-5q87-hr66.