---
title: "CVE-2024-46957: Mellium allows Authentication Bypass by Spoofing"
url: https://erroneo.us/security/cve/CVE-2024-46957/
description: "CVE-2024-46957 (mellium.im/xmpp (Go)): Mellium mellium.im/xmpp 0.0.1 through 0.21.4 allows response spoofing if the implementation uses predictable IDs…"
type: vulnerability-record
section: "Security Digest"
date_published: 2024-09-24
date_modified: 2024-09-26
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2024-46957"
kev: false
cvss: 9.3
epss: 0.00612
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2024-46957: Mellium allows Authentication Bypass by Spoofing

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.6% , percentile 49: FIRST’s model estimates a 0.6% chance of exploitation activity in the next 30 days, higher than 49% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes mellium.im/xmpp (Go) < 0.22.0, fixed in 0.22.0 . Check your lockfile, including transitive dependencies.

## What it is

Mellium mellium.im/xmpp 0.0.1 through 0.21.4 allows response spoofing if the implementation uses predictable IDs because the stanza type is not checked. This is fixed in 0.22.0.

## Affected packages

- Go `mellium.im/xmpp` < 0.22.0 → fixed: 0.22.0

## Affected products (CVE record)

- n/a n/a: see advisory

## Severity

- CISA-ADP CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
- GitHub CVSS 4.0: 9.3 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.61% probability of exploitation activity in the next 30 days; percentile 49.

## Sources

- [GitHub Advisory GHSA-98hf-m87w-cq6h](https://github.com/advisories/GHSA-98hf-m87w-cq6h)
- [CVE.org record CVE-2024-46957](https://www.cve.org/CVERecord?id=CVE-2024-46957)
- [NVD entry CVE-2024-46957](https://nvd.nist.gov/vuln/detail/CVE-2024-46957)
- [codeberg.org](https://codeberg.org/mellium/xmpp/releases)
- [mellium.im](https://mellium.im/cve/cve-2024-46957/)
- [codeberg.org](https://codeberg.org/mellium/xmpp/releases/tag/v0.22.0)

---
Source page: https://erroneo.us/security/cve/CVE-2024-46957/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt