Vulnerability-Lookup

CVE-2026-34231 (GCVE-0-2026-34231)

Vulnerability from cvelistv5 – Published: 2026-03-31 15:33 – Updated: 2026-03-31 17:21

Title

Slippers: Cross-Site Scripting (XSS) in `attrs` Template Tag

Summary

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.

Severity ?

6.1 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

GitHub_M

References

URL

Tags

	https://github.com/mixxorz/slippers/security/advi…	x_refsource_CONFIRM
	https://github.com/mixxorz/slippers/commit/16cc4e…	x_refsource_MISC
	https://github.com/mixxorz/slippers/releases/tag/0.6.3	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	mixxorz	slippers	Affected: < 0.6.3

Show details on NVD website

JSON

To clipboard

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GHSA-W7RV-GFP4-J9J3

Vulnerability from github – Published: 2026-03-30 17:20 – Updated: 2026-03-31 18:55

Summary

Slippers Vulnerable to Cross-Site Scripting (XSS) in `attrs` Template Tag

Details

Summary

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.

Vulnerability details

Root cause

AttrsNode is a custom Node subclass registered via register.tag(). Unlike register.simple_tag(), which automatically applies conditional_escape() when autoescape is on, custom Node.render() methods receive no automatic escaping and are fully responsible for sanitising their output. attr_string() fails to do this:

def attr_string(key: str, value: Any):
    if isinstance(value, bool):
        return key if value else ""
    key = key.replace("_", "-")
    return f'{key}="{value}"'   # value is not escaped

Attack scenario

Given a template that uses {% attrs %} with a user-supplied value:

{% load slippers %}
<input {% attrs type placeholder %}>

render(request, "search.html", {"placeholder": request.GET.get("q", "")})

An attacker crafting a request with q=" onmouseover="alert(document.cookie)" x=" produces:

<input type="text" placeholder="" onmouseover="alert(document.cookie)" x="">

Impact

Any template that passes values derived from user input, database content, or other untrusted sources to {% attrs %} is vulnerable. Successful exploitation can lead to session hijacking, credential theft, arbitrary actions on behalf of the victim, and page defacement.

Remediation

Replace the f-string in attr_string() with format_html(), which escapes both key and value:

from django.utils.html import format_html

def attr_string(key: str, value: Any):
    if isinstance(value, bool):
        return key if value else ""
    key = key.replace("_", "-")
    return format_html('{}="{}"', key, value)

Until a patch is available, sanitise untrusted values before passing them to {% attrs %}, for example with django.utils.html.escape() in the view layer.

Severity ?

6.1 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.6.2"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "slippers"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.6.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-34231"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-30T17:20:04Z",
    "nvd_published_at": "2026-03-31T16:16:32Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nA 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.\n\n## Vulnerability details\n\n### Root cause\n\n`AttrsNode` is a custom `Node` subclass registered via `register.tag()`. Unlike `register.simple_tag()`, which automatically applies `conditional_escape()` when autoescape is on, custom `Node.render()` methods receive no automatic escaping and are fully responsible for sanitising their output. `attr_string()` fails to do this:\n\n```python\ndef attr_string(key: str, value: Any):\n    if isinstance(value, bool):\n        return key if value else \"\"\n    key = key.replace(\"_\", \"-\")\n    return f\u0027{key}=\"{value}\"\u0027   # value is not escaped\n```\n\n### Attack scenario\n\nGiven a template that uses `{% attrs %}` with a user-supplied value:\n\n```django\n{% load slippers %}\n\u003cinput {% attrs type placeholder %}\u003e\n```\n\n```python\nrender(request, \"search.html\", {\"placeholder\": request.GET.get(\"q\", \"\")})\n```\n\nAn attacker crafting a request with `q=\" onmouseover=\"alert(document.cookie)\" x=\"` produces:\n\n```html\n\u003cinput type=\"text\" placeholder=\"\" onmouseover=\"alert(document.cookie)\" x=\"\"\u003e\n```\n\n## Impact\n\nAny template that passes values derived from user input, database content, or other untrusted sources to `{% attrs %}` is vulnerable. Successful exploitation can lead to session hijacking, credential theft, arbitrary actions on behalf of the victim, and page defacement.\n\n## Remediation\n\nReplace the f-string in `attr_string()` with `format_html()`, which escapes both key and value:\n\n```python\nfrom django.utils.html import format_html\n\ndef attr_string(key: str, value: Any):\n    if isinstance(value, bool):\n        return key if value else \"\"\n    key = key.replace(\"_\", \"-\")\n    return format_html(\u0027{}=\"{}\"\u0027, key, value)\n```\n\nUntil a patch is available, sanitise untrusted values before passing them to `{% attrs %}`, for example with `django.utils.html.escape()` in the view layer.",
  "id": "GHSA-w7rv-gfp4-j9j3",
  "modified": "2026-03-31T18:55:30Z",
  "published": "2026-03-30T17:20:04Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/mixxorz/slippers/security/advisories/GHSA-w7rv-gfp4-j9j3"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34231"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mixxorz/slippers/commit/16cc4ef4fa8ad2f7aee30798f16c3e7b653423b2"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/mixxorz/slippers"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mixxorz/slippers/releases/tag/0.6.3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Slippers Vulnerable to Cross-Site Scripting (XSS) in `attrs` Template Tag"
}

FKIE_CVE-2026-34231

Vulnerability from fkie_nvd - Published: 2026-03-31 16:16 - Updated: 2026-04-03 14:51

Severity ?

6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/mixxorz/slippers/commit/16cc4ef4fa8ad2f7aee30798f16c3e7b653423b2	Patch
security-advisories@github.com	https://github.com/mixxorz/slippers/releases/tag/0.6.3	Release Notes
security-advisories@github.com	https://github.com/mixxorz/slippers/security/advisories/GHSA-w7rv-gfp4-j9j3	Exploit, Vendor Advisory

Impacted products

	Vendor	Product	Version
	django	slippers	*

JSON

To clipboard

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-34231 (GCVE-0-2026-34231)

GHSA-W7RV-GFP4-J9J3

Summary

Vulnerability details

Root cause

Attack scenario

Impact

Remediation

FKIE_CVE-2026-34231

Tags

Sightings

Nomenclature