Timing Attack Affecting org.apache.shiro:shiro-core package, versions [,2.1.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JAVA-ORGAPACHESHIRO-15253618
- published10 Feb 2026
- disclosed10 Feb 2026
- credit4ra1n, Y4tacker
Introduced: 10 Feb 2026
CVE-2026-23901 (opens in a new tab)How to fix?
Upgrade org.apache.shiro:shiro-core to version 2.1.0 or higher.
Overview
org.apache.shiro:shiro-core is a powerful and easy-to-use Java security framework that performs authentication, authorization, cryptography, and session management.
Affected versions of this package are vulnerable to Timing Attack in the authentication process. An attacker can infer the existence of valid usernames by measuring response times during authentication attempts.