{
 "id": "WPSEC-2026-2279",
 "url": "https://wpsec.com/vuln/WPSEC-2026-2279/",
 "json_url": "https://wpsec.com/vuln/WPSEC-2026-2279/advisory.json",
 "markdown_url": "https://wpsec.com/vuln/WPSEC-2026-2279/index.md",
 "title": "Sign-up Sheets <= 2.4.0 - Reflected Cross-Site Scripting via Sign-up Link",
 "description": "The Sign-up Sheets plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the request URL used to build the \"Sign up\" link on public sign-up sheet pages in all versions up to, and including, 2.4.0. This is due to insufficient output escaping: the current URL is passed through esc_url() before add_query_arg() is applied, and add_query_arg() decodes and re-emits the query string keys without encoding them. This makes it possible for unauthenticated attackers to inject arbitrary web scripts that run in a user's browser if they can trick the user into clicking a crafted link.",
 "plugin": {
  "slug": "sign-up-sheets",
  "name": "Sign-up Sheets",
  "full_name": "Sign-up Sheets",
  "wordpress_org": "https://wordpress.org/plugins/sign-up-sheets/",
  "advisories_url": "https://wpsec.com/vuln/plugin/sign-up-sheets/",
  "attacksurface": "https://attacksurface.wpsec.com/plugin/sign-up-sheets"
 },
 "type": "XSS",
 "cwe": [
  "CWE-79"
 ],
 "cve": [],
 "cvss": {
  "version": "3.1",
  "score": 6.1,
  "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
  "severity": "Medium"
 },
 "affected": {
  "ranges": [
   {
    "from": null,
    "from_inclusive": true,
    "to": "2.4.1",
    "to_inclusive": false
   }
  ],
  "text": [
   "all versions before 2.4.1"
  ]
 },
 "introduced_in": null,
 "fixed_in": "2.4.1",
 "remediation": "Update to 2.4.1 or later.",
 "fix_released": "2026-10-31T14:49:40+00:00",
 "published": "2026-11-03T14:48:33+00:00",
 "updated": "2026-11-03T13:22:54.996895+00:00",
 "also_published_as": null,
 "references": [
  "https://wpsec.com/vuln/WPSEC-2026-2279/",
  "https://plugins.svn.wordpress.org/sign-up-sheets/tags/2.4.1/",
  "https://wordpress.org/plugins/sign-up-sheets/"
 ],
 "attacksurface_url": "https://attacksurface.wpsec.com/plugin/sign-up-sheets",
 "source": "WPSec",
 "license": {
  "name": "CC BY 4.0",
  "url": "https://creativecommons.org/licenses/by/4.0/"
 },
 "usage": {
  "plugin": "Low",
  "affected_versions": "None seen",
  "as_of": "2026-11-03"
 }
}