CVE-2026-115748: Apache Vysper: Authorization bypass

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-26 · updated 2026-10-26
Weakness: CWE-639

Description

**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.

Affected products

Apache Software Foundation Apache Vysper: all versions

References

https://lists.apache.org/thread.html/979n9lzg10vc7tdrrlgy4lh5yrsw8wsj
https://mina.apache.org/vysper-project/
http://www.openwall.com/lists/oss-security/2026/10/23/21

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