Stop Spammers Classic <= 2026.6 — Unauthenticated Stored Cross-Site Scripting via 'author' Parameter
CVE-2026-120477Published · Updated Action summary
Affected: ≤2026.6Update to 2026.7 or newer
All remediation steps- Severity
- Medium4.7
- CVSS
- 4.7CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:HAttack complexity- High
PR:NPrivileges required- None
UI:RUser interaction- Required
S:CScope- Changed
C:LConfidentiality- Low
I:LIntegrity- Low
A:NAvailability- None
- Weakness
- CWE-79 Cross-Site Scripting
- Required access
- No account needed
- Exploit prediction (EPSS)
- 0.3% chance in 30 days16th percentile
- CISA KEV
- Not listed
On this page8
Am I affected?
Stop Spammers Classic stop-spammer-registrations-plugin
- Affected≤ 2026.6
- Patched in2026.7
Update to 2026.7 or newer.
You are affected if you run ≤ 2026.6. Version 2026.7 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.
- No account is needed to exploit this. Treat any exposed site on an affected version as at risk.
What to do
- Update to version 2026.7, 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 Mohamed Amgad Khater (mamgad).
The Stop Spammers Classic plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'author' POST parameter in versions up to, and including, 2026.6. An unauthenticated POST handled on init stores the attacker-supplied author field (after sanitize_text_field, which does not escape single quotes) into the ss_stop_sp_reg_stats option history. The Log Report admin page then renders that stored value inside a single-quoted JavaScript string within a double-quoted onclick attribute using esc_js(); because esc_js() uses _wp_specialchars with ENT_COMPAT it does not escape single quotes, allowing the stored value to break out of the JS string literal and inject arbitrary JavaScript. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute whenever an administrator with manage_options access clicks the 'Report to SFS' link on an attacker-poisoned log row (the StopForumSpam API key must be configured for that link to be rendered — the field is empty by default). Successful exploitation additionally requires an action by an administrator — the attacker cannot trigger the vulnerability on their own.
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 |
|---|---|---|---|
| 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 | |
| Medium4.4 | Authenticated (Admin+) Stored Cross-Site Scripting ≤2022.6Update to 2023 | CVE-2023-2489 |
- 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
- Medium4.4Authenticated (Admin+) Stored Cross-Site Scripting
≤2022.6Update to 2023
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 4.7
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.
- EPSS
- Exploit Prediction Scoring System by FIRST.org.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.