CVE-2021-24440

Name: CVE-2021-24440
Creator: NVD / NIST
Published: 2021-07-12T20:15:09.633+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.8/10EPSS 0.62%

Last modified Jun 17, 2026

CVE-2021-24440 is a medium-severity vulnerability rated 4.8/10 on the CVSS scale. 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. EPSS estimates a 0.62% chance of exploitation in the next 30 days.

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

Metrics

CVSS 3.1

4.8/10

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

EPSS Probability

0.62%

45.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Fetchdesigns	Sign-Up Sheets	< 1.0.14

References

https://wpscan.com/vulnerability/ba4503f7-684e-4274-bc53-3aa848712496Exploit, Third Party Advisory
https://wpscan.com/vulnerability/ba4503f7-684e-4274-bc53-3aa848712496Exploit, Third Party Advisory

Timeline

Published: Jul 12, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-24440?

How severe is CVE-2021-24440?

CVE-2021-24440 has a CVSS score of 4.8/10 (MEDIUM severity). The EPSS model estimates a 0.62% probability of exploitation in the next 30 days.

How do I fix CVE-2021-24440?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-24440?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST