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Vulnerabilities

Vulnerability · CVE-2026-103039

The Gravity Forms plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 3.1.2 via a Post Custom Field whose input type is List.

Published Oct 30, 2026 · catalog updated Oct 30, 2026 · Gravity Forms Gravity Forms

Last checked Nov 5, 2026. A connected source was read within the last 7 days.

Patch now

CVE-2026-103039 is in the CISA known-exploited catalog. Confirm Gravity Forms Gravity Forms against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Same product and reporting

Severity
Critical9.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
0.51%
Remediation
Remediation guidance
Affected products
stated Gravity Forms · vendor Gravity Forms · vendor Gravity Forms Gravity Forms

The Gravity Forms plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 3.1.2 via a Post Custom Field whose input type is List. This is due to GFFormsModel::create_post() passing the submitted value to WordPress' unrestricted global maybe_unserialize() rather than the plugin's own hardened GFCommon::maybe_unserialize(), which was added in 3.1.1 and passes allowed_classes => false precisely to prevent object instantiation. Where the field has a content template enabled, the submitted row reaches that call verbatim. This makes it possible for unauthenti

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 Gravity Forms<= 3.1.2
  • vendor Gravity Formsversion unspecified
  • vendor Gravity Forms Gravity Formsversion unspecified

How to fix CVE-2026-103039

What to do

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

Should you patch?

CVE-2026-103039 is in the CISA known-exploited catalog. Confirm Gravity Forms Gravity Forms against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with Gravity Forms <= 3.1.2. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

No weakness class is stored. EPSS 0.51%. The CISA KEV listing is the exploitation evidence. 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.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 30, 2026 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

  2. Oct 30, 2026 · EUVD

    Detected

    The Gravity Forms plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 3.1.2 via a Post Custom Field whose input type is List. This is due to GFFormsModel::create_post() passing the submitted value to WordPress' unrestricted global maybe_unserialize() rather than the plugin's own hardened GFCommon::maybe_unserialize(), which was added in 3.1.1 and passes

Sources

  • CVE.orgVulnerability recordCVE-2026-103039

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-103039

    30-day exploitation probability 0.51%

    first.org
  • EUVDVulnerability recordEUVD-2026-113740

    The Gravity Forms plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 3.1.2 via a Post Custom Field whose input type is List. This is due to GFFormsModel::create_post() passing the submitted value to WordPress' unrestricted global mayb

    euvd.enisa.europa.eu
  • VulnCheck KEVConfirmed exploitationCVE-2026-103039

    The Gravity Forms plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 3.1.2 via a Post Custom Field whose input type is List. This is due to GFFormsModel::create_post() passing the submitted value to WordPress' unrestricted global mayb

    vulncheck.com

References

Freshness

Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 5, 2026
  • VulnCheck KEVNov 3, 2026
  • CVE.orgOct 30, 2026
  • EUVDOct 30, 2026