Unrated

Stored XSS in NEX-Forms WordPress Plugin _name[] Parameter

IdentifiersCVE-2026-12142CWE-79

CVE-2026-12142 is a stored cross-site scripting vulnerability in the NEX-Forms – Ultimate Forms Plugin for WordPress affecting all versions up to and including 9.2.2. The flaw is caused by insufficient input sanitization and output escaping of the '_name[]' array parameter. An attacker can supply malicious HTML/JavaScript payloads that are stored by the application and later rendered in application pages. The issue is not effectively mitigated by the plugin's wp_kses() filtering because the NEXForms_allowed_tags() allow-list explicitly permits dangerous elements and attributes, including <script>, <iframe src/srcdoc>, and JavaScript event-handler attributes such as onClick, onBlur, and onChange.

For your environment

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows arbitrary JavaScript to execute in the browsers of users who view a page containing the injected payload. Depending on the victim's privileges, this can enable session hijacking, nonce theft, unauthorized actions performed in the victim's context, defacement of rendered content, credential capture, and potential administrative compromise of the WordPress site if an administrator views the malicious content.

Mitigation

If you can’t patch tonight, do this now.

If an immediate patch is not available, restrict or disable functionality that accepts or renders untrusted '_name[]' input, review and remove malicious stored content, and reduce exposure by limiting who can submit forms or content processed by the plugin. Deploy compensating controls such as a restrictive Content Security Policy where feasible, monitor for injected script/iframe payloads in stored form data, and consider temporarily disabling the plugin until a fixed release is installed.

Remediation

Patch, then assume compromise.

Upgrade the NEX-Forms – Ultimate Forms Plugin for WordPress to a fixed version later than 9.2.2 if one is available from the vendor. The vulnerable handling of the '_name[]' parameter should be corrected by enforcing strict server-side input sanitization and context-appropriate output escaping, and by removing dangerous tags and attributes from the allow-list used by NEXForms_allowed_tags(). In particular, <script>, iframe capabilities that permit script execution, and inline JavaScript event handlers should not be permitted in untrusted content.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

ACTIVITY FEED

Recent activity

8 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.

8 SOURCESView more in app

No news coverage yet. Advisories and community discussion only.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity8

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES

MITRE CVE

cve.org · CVE-2026-12142

NVD

nvd.nist.gov/vuln/detail/CVE-2026-12142

MITRE CWE · CWE-79

cwe.mitre.org