Missing Critical Step in Authentication Affecting org.apache.camel:camel-shiro package, versions [4.0.0,4.18.5)[4.19.0,4.22.1)
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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- published22 Oct 2026
- disclosed19 Oct 2026
- creditClaude Security
Introduced: 19 Oct 2026
NewCVE-2026-84181 (opens in a new tab)How to fix?
Upgrade org.apache.camel:camel-shiro to version 4.18.5, 4.22.1 or higher.
Overview
Affected versions of this package are vulnerable to Missing Critical Step in Authentication via the authenticateUser() method in ShiroSecurityProcessor in the Shiro component. An attacker can access Shiro-protected routes as an authenticated user by sending an exchange that names a principal already bound to a reused worker thread, without valid credentials of their own; the processor accepts the exchange without verifying its password. This occurs when alwaysReauthenticate=false and the prior subject remains bound to the thread.
Notes
- The authentication bypass is gated on
alwaysReauthenticate=false; the default istrue, which logs out the subject after each exchange and masks the flaw.
Workarounds
- Clear the Shiro subject from the thread at the end of every exchange to prevent a reused worker thread from carrying an authenticated subject into a later exchange.