CVE-2024-32521Network attack vector

Unauthenticated spam-protection bypass

Published May 17, 2024 · Updated Apr 28, 2026

Protection-mechanism bypass in Highfivery Zero Spam for WordPress 5.5.6 and earlier allows remote attackers to evade spam checks. Published advisories identify a client-side enforcement failure but do not disclose the affected function, request field, or validation path. No authentication or user interaction is required; the bounded reported consequence is bypass of spam protection, while any further effect is undisclosed.

CVSS severity5.3
Medium
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Protection-mechanism bypass in Highfivery Zero Spam for WordPress 5.5.6 and earlier allows remote attackers to evade spam checks. Published advisories identify a client-side enforcement failure but do not disclose the affected function, request field, or validation path. No authentication or user interaction is required; the bounded reported consequence is bypass of spam protection, while any further effect is undisclosed.

The record

CVE
CVE-2024-32521
Published
May 17, 2024
Updated
Apr 28, 2026
Vendor
Highfivery LLC
Product
Zero Spam for WordPress
Classifications
CWE-602, CAPEC-207, T1562.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 17, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a <=5.5.6 changes=[{"at":"5.5.7","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Highfivery LLC · Zero Spam for WordPressversion=n/a <=5.5.6 changes=[{"at":"5.5.7","status":"unaffected"}]
Highfivery · Zero Spam for WordPressversion=0 <=5.5.6

Published CVSS scores

5.3PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-602Client-Side Enforcement of Server-Side Security
CAPEC-207Removing Important Client Functionality
T1562.001Impair Defenses: Disable or Modify Tools

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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