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WordPress plugin

Sign-up Sheets <= 1.0.13 — Stored Cross-Site Scripting

CVE-2021-24440Published · Updated

Action summary

Affected: <1.0.14Update to 1.0.14 or newer

All remediation steps
Watch plugin
Severity
Medium4.8
CVSS
4.8
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
What does this vector mean?
AV:N Attack vector
Network
AC:L Attack complexity
Low
PR:H Privileges required
High
UI:R User interaction
Required
S:C Scope
Changed
C:L Confidentiality
Low
I:L Integrity
Low
A:N Availability
None
Weakness
CWE-79 Cross-Site Scripting
Required access
Unknown
Exploit prediction (EPSS)
No score
CISA KEV
Not listed
On this page8

Am I affected?

Sign-up Sheets sign-up-sheets

  1. Affected< 1.0.14
  2. Patched in1.0.14

Update to 1.0.14 or newer.

You are affected if you run < 1.0.14. Version 1.0.14 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Sign-up Sheets.
  • No admin access? Run a passive check of your site. It reads public files only.

What to do

  1. Update to version 1.0.14, or a newer patched version
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch Sign-up Sheets to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Ajay Sandipan Thorbole.

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

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

More in Sign-up Sheets

All 10
More vulnerabilities in Sign-up Sheets
SeverityVulnerabilityCVEPublished
Medium4.3Cross-Site Request Forgery
≤2.3.0Update to 2.4.0
CVE-2026-92410
High8.1Unauthenticated PHP Object Injection
≤2.3.2Update to 2.3.3
CVE-2025-49393
Medium4.3Cross-Site Request Forgery
≤2.3.3Update to 2.3.3.1
CVE-2025-49391
Medium6.5Unauthenticated Arbitrary Shortcode Execution
≤2.3.0.1Update to 2.3.1
CVE-2025-26996
Medium6.1Reflected Cross-Site Scripting
≤2.2.12Update to 2.2.13
CVE-2024-6020

Same weakness (Cross-Site Scripting)

All Cross-Site Scripting
Other Cross-Site Scripting vulnerabilities
SeverityVulnerabilityCVEPublished
High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup≤5.25.25Update to 5.26.45
CVE-2026-120688
Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder≤1.0.2Update to 1.1
CVE-2026-125055
Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System≤3.3.9Update to 3.4.0
CVE-2026-119077
Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce≤5.127.0Update to 5.128.0
CVE-2026-121518

Timeline

  1. CVE published

    Severity medium, CVSS 4.8

  2. Record last updated

Sources & licenses

Wordfence record
Vulnerability data
Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
CVE® identifiers
Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
CVSS / CWE
National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
VulnCrest content
Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.

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