CVE-2021-24440: Sign-up Sheets < 1.0.14 - Authenticated Stored Cross-Site Scripting (XSS)

Severity: medium (CVSS 4.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-07-12 · updated 2026-06-17
Weakness: CWE-79

Description

The Sign-up Sheets WordPress plugin before 1.0.14 did not sanitise or escape some of its fields when creating a new sheet, allowing high privilege users to add JavaScript in them, leading to a Stored Cross-Site Scripting issue. The payloads will be triggered when viewing the 'All Sheets' page in the admin dashboard

Affected products

Fetch Designs Sign-up Sheets: before 1.0.14 — fixed in 1.0.14

How to fix

Upgrade to a fixed version: Fetch Designs Sign-up Sheets 1.0.14. Check the vendor advisory for mitigations.

References

https://wpscan.com/vulnerability/ba4503f7-684e-4274-bc53-3aa848712496
https://wpscan.com/vulnerability/ba4503f7-684e-4274-bc53-3aa848712496

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