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N A - Security Vulnerability (CVE-2021-37597)

CVE-2021-37597

Vulnerability CVE-2021-37597 PLUGIN n-a CRITICAL

WP Cerber before 8.9.3 allows MFA bypass via wordpress_logged_in_[hash] manipulation.

CVE-2021-37597

CRITICAL CVSS 9.8 Published 2021-08-19 Updated 2026-06-17
AI Risk Critical (100/100) Active Exploit: Likely Published Exploit: Public exploit references found Priority: P1 Immediate
Severity Band CRITICAL
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Components 1
Reference Links 2
AI Risk Engine Critical (100/100)
Exploitability High
Active Exploitation Likely
Published Exploit Status Public exploit references found

Threat Timeline

  1. 2021-08-19 CVE published and first recorded in the threat feed.
  2. 2026-06-17 Record updated with latest vulnerability metadata.
  3. 2026-04-12 AI technical context refreshed for mitigation and impact guidance.
  4. Now Monitoring for follow-up changes, linked references, and new related CVEs.

AI Context

Machine-generated threat intelligence

AI Updated 184 days ago

AI enriched 184 days ago (2026-04-12 02:20 UTC)

Technical Summary

WP Cerber before 8.9.3 allows MFA bypass via wordpress_logged_in_[hash] manipulation.

Potential Impact

Severity is CRITICAL (CVSS 9.8). Depending on deployment context, affected components may be exposed to unauthorized actions or data integrity risk.

Exploitability Assessment

Exploitability is assessed as High based on published exploit references.

Primary risk drivers: published exploit references

Mitigation Recommendations

Validate affected product versions, prioritize patching, and monitor references for vendor remediation guidance. If immediate patching is not possible, apply compensating controls and limit exposure of vulnerable surfaces.

Detection & Monitoring

Track authentication anomalies, unexpected file writes, and suspicious plugin API activity around affected components.

Business Impact Lens

AI risk score 100/100 (Critical, High) with priority P1 Immediate. Prioritize remediation where affected components process customer data, admin sessions, or Internet-exposed workflows.

Affected Products

N A PLUGIN · n-a Affected: < 8.9.3 Fixed in: 8.9.3

Related Vulnerabilities

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N A - Cross-Site Scripting (XSS) (CVE-2026-39071) CVE-2026-39071 Published 2026-08-28 N A - Cross-Site Scripting (XSS) (CVE-2026-39070) CVE-2026-39070 Published 2026-08-28 N A - Privilege Escalation (CVE-2025-66428) CVE-2025-66428 Published 2026-01-22 N A - PHP Object Injection (CVE-2023-22851) CVE-2023-22851 Published 2023-01-14 N A - Cross-Site Scripting (XSS) (CVE-2021-41951) CVE-2021-41951 Published 2021-11-15 N A - XML External Entity (XXE) (CVE-2020-21524) CVE-2020-21524 Published 2020-09-30

References

What to do about this

Patch immediately Serious, and reachable without meaningful privilege.

Fix it

Update N A to 8.9.3 or later.

That is the complete fix. Everything below is what protects you in the meantime.

No Hack Halt control meaningfully contains this one — updating is the remedy. We would rather say so than sell you something that will not help.

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Am I affected by this vulnerability?

You are affected if your site runs N A. Versions below 8.9.3 are vulnerable; that release and later are not.

How do I fix it?

Update N A to version 8.9.3 or later. That is the complete fix.

WordPress security that blocks attacks before they land.

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