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Vulnerabilities

Vulnerability · CVE-2026-1490

The Spam protection, Anti-Spam, FireWall by CleanTalk plugin for WordPress is vulnerable to unauthorized Arbitrary Plugin Installation due to an authorization bypass via reverse DN

Published Feb 15, 2026 · catalog updated Apr 8, 2026 · Spam protection, Honeypot, Anti-Spam by CleanTalk

Last checked Nov 4, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-1490. EPSS is 1.28%. Act only if a listed version of Spam protection, Honeypot, Anti-Spam by CleanTalk is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.28%
Remediation
Vendor / distro source
Affected products
vendor cleantalk Spam protection, Honeypot, Anti-Spam by CleanTalk 0 ≤6.71

The Spam protection, Anti-Spam, FireWall by CleanTalk plugin for WordPress is vulnerable to unauthorized Arbitrary Plugin Installation due to an authorization bypass via reverse DNS (PTR record) spoofing on the 'checkWithoutToken' function in all versions up to, and including, 6.71. This makes it possible for unauthenticated attackers to install and activate arbitrary plugins which can be leveraged to achieve remote code execution if another vulnerable plugin is installed and activated. Note: This is only exploitable on sites with an invalid API key.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor cleantalk Spam protection, Honeypot, Anti-Spam by CleanTalk 0 ≤6.710 ≤6.71

How to fix CVE-2026-1490

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-1490. EPSS is 1.28%. Act only if a listed version of Spam protection, Honeypot, Anti-Spam by CleanTalk is installed.

Which versions are affected?

Compare what you have installed with cleantalk Spam protection, Honeypot, Anti-Spam by CleanTalk 0 ≤6.71 0 ≤6.71. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 1.28%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

WordPress security

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 15, 2026 · EUVD

    Detected

    The Spam protection, Anti-Spam, FireWall by CleanTalk plugin for WordPress is vulnerable to unauthorized Arbitrary Plugin Installation due to an authorization bypass via reverse DNS (PTR record) spoofing on the 'checkWithoutToken' function in all versions up to, and including, 6.71. This makes it possible for unauthenticated attackers to install and activate arbitrary plugins which can be leverage

  2. Apr 8, 2026 · EUVD

    Updated

    The Spam protection, Anti-Spam, FireWall by CleanTalk plugin for WordPress is vulnerable to unauthorized Arbitrary Plugin Installation due to an authorization bypass via reverse DNS (PTR record) spoofing on the 'checkWithoutToken' function in all versions up to, and including, 6.71. This makes it possible for unauthenticated attackers to install and activate arbitrary plugins which can be leverage

Sources

  • CVE.orgVulnerability recordCVE-2026-1490

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-1490

    30-day exploitation probability 1.28%

    first.org
  • EUVDVulnerability recordEUVD-2026-5835

    The Spam protection, Anti-Spam, FireWall by CleanTalk plugin for WordPress is vulnerable to unauthorized Arbitrary Plugin Installation due to an authorization bypass via reverse DNS (PTR record) spoofing on the 'checkWithoutToken' function in all versions up to, and including, 6.

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 3, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgNov 4, 2026
  • FIRST EPSSNov 3, 2026
  • EUVDNov 2, 2026