CVE-2016-4436 Apache Struts improper action name cleanup

What is CVE-2016-4436?

CVE-2016-4436 is a critical vulnerability in Apache Struts, published on 3 Oct 2016. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Apache Struts 2 before 2.3.29 and 2.5.x before 2.5.1 allow attackers to have unspecified impact via vectors related to improper action name clean up.

Which versions are affected by CVE-2016-4436?

4 open source packages ship an affected version, including org.apache.struts:struts2-core. It affects 1 product.

Products include Apache Struts.

How do I fix CVE-2016-4436?

Upgrade org.apache.struts:struts2-core to a fixed version for your release line: 2.3.29 or 2.5.1.

Is CVE-2016-4436 being exploited?

There is no known exploitation of CVE-2016-4436 in the wild and no public exploit code.

Other vulnerabilities in Apache Struts

• CVE-2020-17530 Apache Struts Remote Code Execution Exploited Critical 9.8
• CVE-2017-9791 Apache Struts 1 Improper Input Validation Exploited Critical 9.8
• CVE-2017-5638 Apache Struts Remote Code Execution Exploited Critical 9.8
• CVE-2012-0391 Apache Struts 2 Improper Input Validation Exploited Critical 9.8
• CVE-2018-11776 Apache Struts Remote Code Execution Exploited High 8.1

All Apache Struts vulnerabilities

Sources

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

Also known as GHSA-xm92-v2mq-842q.