Stop Spammers Security <= 2021.17 — Authenticated (Admin+) Stored Cross-Site Scripting
CVE-2021-24517Published · Updated Action summary
Affected: <2021.18Update to 2021.18 or newer
All remediation steps- Severity
- Medium4.8
- CVSS
- 4.8CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:HPrivileges required- High
UI:RUser interaction- Required
S:CScope- Changed
C:LConfidentiality- Low
I:LIntegrity- Low
A:NAvailability- 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?
Stop Spammers Classic stop-spammer-registrations-plugin
- Affected< 2021.18
- Patched in2021.18
Update to 2021.18 or newer.
You are affected if you run < 2021.18. Version 2021.18 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Stop Spammers Classic.
- No admin access? Run a passive check of your site. It reads public files only.
What to do
- Update to version 2021.18, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Stop Spammers Classic to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to swapnil subhash bodekar.
The Stop Spammers Security | Block Spam Users, Comments, Forms WordPress plugin before 2021.18 does not escape some of its settings, allowing high privilege users such as admin to set Cross-Site Scripting payloads in them even when the unfiltered_html capability is disallowed
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in Stop Spammers Classic
All 10| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium4.7 | Unauthenticated Stored Cross-Site Scripting via 'author' Parameter ≤2026.6Update to 2026.7 | CVE-2026-120477 | |
| High7.2 | Unauthenticated Stored Cross-Site Scripting ≤2026.3Update to 2026.4 | CVE-2026-48876 | |
| Medium4.3 | Cross-Site Request Forgery via Email Allowlist ≤2026.1Update to 2026.2 | CVE-2025-14795 | |
| Medium5.4 | Cross-Site Request Forgery to Multiple Administrative Actions ≤2024.7Update to 2025 | CVE-2025-2935 | |
| Medium5.4 | Cross-Site Request Forgery (CSRF) via sfs_process ≤2024.4Update to 2024.5 | CVE-2023-7065 |
- Medium4.7Unauthenticated Stored Cross-Site Scripting via 'author' Parameter
≤2026.6Update to 2026.7
- High7.2Unauthenticated Stored Cross-Site Scripting
≤2026.3Update to 2026.4
- Medium4.3Cross-Site Request Forgery via Email Allowlist
≤2026.1Update to 2026.2
- Medium5.4Cross-Site Request Forgery to Multiple Administrative Actions
≤2024.7Update to 2025
- Medium5.4Cross-Site Request Forgery (CSRF) via sfs_process
≤2024.4Update to 2024.5
Same weakness (Cross-Site Scripting)
All Cross-Site Scripting| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header | CVE-2026-120688 | |
| Critical9.8 | Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission | CVE-2026-125055 | |
| Critical9.8 | Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter | CVE-2026-119077 | |
| Medium5.3 | Unauthenticated Sensitive Information Exposure in 'search' Parameter | CVE-2026-121518 |
- 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
- 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
- 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
- Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce
≤5.127.0Update to 5.128.0
Timeline
CVE published
Severity medium, CVSS 4.8
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.