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CVE-2026-23901

2.5 · LOW

Observable Timing Discrepancy vulnerability in Apache Shiro.

Published Feb 10, 2026CWE-208EPSS 0.24%

Overview

CVE-2026-23901 is a low-severity vulnerability. It was published on February 10, 2026 and has a CVSS 3.1 base score of 2.5 (LOW).

This vulnerability has a CVSS 3.1 base score of 2.5, rated LOW. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

Observable Timing Discrepancy vulnerability in Apache Shiro.

This issue affects Apache Shiro: from 1.*, 2.* before 2.0.7.

Users are recommended to upgrade to version 2.0.7 or later, which fixes the issue.

Prior to Shiro 2.0.7, code paths for non-existent vs. existing users are different enough,

that a brute-force attack may be able to tell, by timing the requests only, determine if

the request failed because of a non-existent user vs. wrong password.

The most likely attack vector is a local attack only.

Shiro security model  https://shiro.apache.org/security-model.html#username_enumeration  discusses this as well.

Typically, brute force attack can be mitigated at the infrastructure level.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Reflists.apache.org/thread/mm1jct9b86jvnh3y44tj22xvjtx3xhhhRefwww.openwall.com/lists/oss-security/2026/02/08/2

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23901?

CVE-2026-23901 is a low-severity vulnerability. It was published on February 10, 2026 and has a CVSS 3.1 base score of 2.5 (LOW).

How severe is CVE-2026-23901?

This vulnerability has a CVSS 3.1 base score of 2.5, rated LOW. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-23901?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-23901?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23901 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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