Vulnerabilities / Sign-up Sheets / WPSEC-2026-2279
Sign-up Sheets <= 2.4.0 - Reflected Cross-Site Scripting via Sign-up Link
Medium 6.1
CWE-79Fixed in 2.4.1
- ID
- WPSEC-2026-2279
- Plugin
- Sign-up Sheets (sign-up-sheets)
- Affected
- all versions before 2.4.1
- Remediation
- Update to 2.4.1 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- Weakness
- CWE-79
- Usage
- Plugin Low · Affected versions None seen among sites WPSec scans, 2026-11-03
- Attack surface
- Sign-up Sheets on WPSec AttackSurface
- Fix released
- Published
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.
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/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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