Bug 2560881 (CVE-2026-115748)

Summary: CVE-2026-115748 org.apache.vysper/vysper-core: Apache Vysper: Account compromise via missing authentication check in In-Band Registration
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: gmalinko, janstey, pdelbell, rstepani
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Apache Vysper. Its implementation of Extensible Messaging and Presence Protocol (XMPP) In-Band Registration lacks an authentication check. An authenticated remote attacker can exploit this vulnerability to compromise other user accounts on the server.
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Description OSIDB Bzimport 2026-10-26 15:32:47 UTC 
**UNSUPPORTED WHEN ASSIGNED**  Authorization bypass in Apache Vysper, all versions.




Apache Vysper is an XMPP (Jabber) server library. Its XEP-0077 (In-Band Registration) implementation is missing an authentication check, allowing any authenticated user to compromise other accounts.




As this project is retired, we do not plan to release a version that fixes this issue. Users are recommended to find an alternative.