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Vulnerabilities

Vulnerability · CVE-2026-4666

The wpForo Forum plugin for WordPress is vulnerable to unauthorized modification of data due to the use of on user-controlled input in the method of in all versions up…

Published Apr 17, 2026 · catalog updated Jun 17, 2026 · the affected product

Check if you run it

No confirmed exploitation is on record for CVE-2026-4666. EPSS is 0.45%. Act only if a listed version of the affected product is installed.

Gaps on this record

  • No plain product name is stored. The page cannot tell you which product to check.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.45%
Remediation
Version ranges on file
Affected products
stated named in the record

The wpForo Forum plugin for WordPress is vulnerable to unauthorized modification of data due to the use of on user-controlled input in the method of in all versions up to, and including, 2.4.16. The action handler in passes directly to , which calls . An attacker can inject to overwrite the local variable, causing the entire permission check block to be skipped. The nonce check uses a hardcoded action shared across all 8 forum templates, so any user who can view any forum page obtains a valid nonce. This makes it possible for authenticated attackers, with Subscriber-level access and above, to edit the title, body, name, and email fields of any forum post, including posts in private forums, admin posts, and moderator posts. Content passes through which strips JavaScript but allows rich HTML.

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.

  • stated named in the record<= 2.4.16

How to fix CVE-2026-4666

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-2026-4666. EPSS is 0.45%. Act only if a listed version of the affected product is installed.

Which versions are affected?

Compare what you have installed with named in the record <= 2.4.16. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-862: Missing Authorization. EPSS 0.45%. 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. Apr 17, 2026 · NIST NVD

    Detected

    The wpForo Forum plugin for WordPress is vulnerable to unauthorized modification of data due to the use of on user-controlled input in the method of in all versions up to, and including, 2.4.16. The action handler in passes directly to , which calls . An attacker can inject to overwrite the local variable, causing the entire permission check block to be skipped. The nonce check uses a hardcoded ac

  2. Jun 17, 2026 · NIST NVD

    Updated

    The wpForo Forum plugin for WordPress is vulnerable to unauthorized modification of data due to the use of on user-controlled input in the method of in all versions up to, and including, 2.4.16. The action handler in passes directly to , which calls . An attacker can inject to overwrite the local variable, causing the entire permission check block to be skipped. The nonce check uses a hardcoded ac

Sources

  • CVE.orgVulnerability recordCVE-2026-4666

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-4666

    30-day exploitation probability 0.4%

    first.org
  • NIST NVDVulnerability recordCVE-2026-4666

    The wpForo Forum plugin for WordPress is vulnerable to unauthorized modification of data due to the use of on user-controlled input in the method of in all versions up to, and including, 2.4.16. The action

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.