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[USN-9061-1] Apache Shiro vulnerabilities

Posted on 12 November 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-9061-1
November 11, 2026

shiro vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 LTS

Summary:

Apache Shiro could allow unintended access to network services.

Software Description:
- shiro: Powerful and easy-to-use Java security framework

Details:

It was discovered that Apache Shiro incorrectly handled certain
specially crafted requests when used with Spring dynamic controllers.
A remote attacker could possibly use this issue to bypass
authentication. (CVE-2020-1957, CVE-2020-11989)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 16.04 LTS
libshiro-java 1.2.4-1ubuntu0.1~esm1
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-9061-1
CVE-2020-11989, CVE-2020-1957

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