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CVE-2026-49768 Happyforms CVE debrief

CVE-2026-49768 is a critical vulnerability in the Happyforms plugin for WordPress, affecting versions up to and including 1.26.13. This vulnerability allows for unauthenticated PHP object injection, which can lead to severe consequences, including code execution, data breaches, and complete control of the affected system. The Common Vulnerability Scoring System (CVSS) score for this vulnerability is 9.8, indicating a critical severity level. The vulnerability was published on [cvePublishedAt](https://www.cve.org/CVERecord?id=CVE-2026-49768) and last modified on [cveModifiedAt](https://nvd.nist.gov/vuln/detail/CVE-2026-49768).

Vendor
Happyforms
Product
Unknown
CVSS
CRITICAL 9.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-15
Original CVE updated
2026-06-15
Advisory published
2026-06-15
Advisory updated
2026-06-15

Who should care

Administrators and users of WordPress sites utilizing the Happyforms plugin, especially those with versions 1.26.13 or earlier, should be aware of this vulnerability and take immediate action to mitigate the risk.

Technical summary

The vulnerability is caused by a lack of proper input validation and sanitization in the Happyforms plugin, allowing an attacker to inject malicious PHP objects. This can be exploited without authentication, making it particularly dangerous.

Defensive priority

High

Recommended defensive actions

  • Update the Happyforms plugin to a version that is not vulnerable (if available).
  • Apply patches or mitigations provided by the vendor or third-party security experts.
  • Monitor your WordPress site for suspicious activity and ensure that all plugins and themes are up-to-date.

Evidence notes

Evidence for this vulnerability comes from [ref-4](https://patchstack.com/database/wordpress/plugin/happyforms/vulnerability/wordpress-happyforms-plugin-1-26-13-php-object-injection-vulnerability?_s_id=cve), a mitigation or vendor reference provided by Patchstack.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-49768 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-49768

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-49768 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-49768

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.