Stop Spammers Classic <= 2026.6 - Unauthenticated Stored Cross-Site Scripting via 'author' Parameter
Summary
| CVE | CVE-2026-120477 |
|---|---|
| State | PUBLISHED |
| Assigner | Wordfence |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-11-07 05:18:11 UTC |
| Updated | 2026-11-07 18:17:16 UTC |
| Description | 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. |
Risk And Classification
Primary CVSS: v3.1 4.7 MEDIUM from [email protected]
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS: 0.002510000 probability, percentile 0.165890000 (date 2026-11-07)
Problem Types: CWE-79 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 4.7 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N |
| 3.1 | CNA | DECLARED | 4.7 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
HighPrivileges Required
NoneUser Interaction
RequiredScope
ChangedConfidentiality
LowIntegrity
LowAvailability
NoneCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Webguyio | Stop Spammers Classic | affected 2026.6 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| plugins.trac.wordpress.org/changeset | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/stop-spammer-registrations-plugin/trunk/classes/ss_lo... | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/stop-spammer-registrations-plugin/trunk/stop-spammer-... | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/stop-spammer-registrations-plugin/trunk/settings/ss_r... | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/stop-spammer-registrations-plugin/trunk/stop-spammer-... | [email protected] | plugins.trac.wordpress.org | |
| www.wordfence.com/threat-intel/vulnerabilities/id/29fe0bc9-b460-4158-86fc-ad298... | [email protected] | www.wordfence.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Mohamed Amgad Khater (mamgad) (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-11-06T15:44:44.000Z | Disclosed |
There are currently no legacy QID mappings associated with this CVE.