AIKIDO-2026-770443
jackrabbit-jcr-server is vulnerable to Session Fixation
93
Critical Risk
This Affects:
jackrabbit-jcr-serverTL;DR
The WebDAV server reattaches a cached authenticated session when a Lock-Token, TransactionId, SubscriptionId, or If header matches a stored token, and it does not check credentials first. A client who presents a matching token can reuse another user's session before authenticating. The fix checks credentials before a cached session is reused.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and the WebDAV server is reachable by untrusted clients.
Background info
jackrabbit-jcr-server is vulnerable to Session Fixation in versions 2.20.0 - 2.20.17 and 2.22.0 - 2.22.4.
How to fix this
Upgrade the org.apache.jackrabbit:jackrabbit-jcr-server library to the patch version.
Links
lists.apache.org/thread/gmbsmrs2lycl9nld7rd0h1r1fc4t75qrlists.apache.org/thread.html/gmbsmrs2lycl9nld7rd0h1r1fc4t75qropenwall.com/lists/oss-security/2026/10/07/27
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