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No exploitation reported

CVE-2026-93766

Happyforms Pro <= 1.38.9 - Unauthenticated Stored Cross-Site Scripting via 'happyforms_client_referer' Parameter

No exploitation reported by the sources we read.

  • Published2026-11-07
  • WeaknessCWE-79

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The Happyforms Pro plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'happyforms_client_referer' parameter in all versions up to, and including, 1.38.9 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Timeline

dates in UTC
  1. 2026-11-0711:26CVE publishedCNA

Versions per branch

Products declared by the CNA

As Wordfence, the CNA that assigned this CVE, declared them in the CVE record; versions as written. NVD lists no product for this CVE yet: this is the only product data so far.

  • Happyforms Proother versions: not affected
    Affected
    • ≤ 1.38.9no fix statedsemver

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-07

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-93766 yet.

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Metasploit modules
none listed
Metasploit Framework

Sources

  • CNACVSS 3.17.22026-11-07
  • NVDCVSS 3.17.2read 2026-11-07
  • CNAweakness (CWE)CWE-792026-11-07
  • NVDweakness (CWE)CWE-79read 2026-11-07

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Published
2026-11-07
Last Modified
2026-11-07
NVD status
Deferred

Frequently asked questions

What is CVE-2026-93766?

The Happyforms Pro plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'happyforms_client_referer' parameter in all versions up to, and including, 1.38.9 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Is CVE-2026-93766 actively exploited?

Active exploitation of CVE-2026-93766 has not been confirmed.

What is the CVSS score for CVE-2026-93766?

CVE-2026-93766 has a CVSS v3 base score of 7.2 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.

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