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8.8

Apache Vysper lets logged‑in users hijack other accounts

CVE-2026-115748 · published 9 days ago
Summary

The Apache Vysper chat server library fails to verify a user's identity when processing registration requests, so anyone who is already logged in can take over other users' accounts. This risk applies to all versions of the library, and no fix will be released because the project is no longer maintained. Organizations should stop using Apache Vysper and move to a different, actively supported chat server solution.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
apache software foundation apache vysper <= *
Original advisory text
Apache Vysper: Authorization bypass
**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.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
8.8 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-639Authorization Bypass Through User-Controlled Key
Timeline
Published26 Oct 2026
Updated4 Nov 2026
First seen26 Oct 2026
Sources
CVE-2026-115748 · NVD
CVE-2026-115748 · MITRE
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