CVSS 7.2 · HIGH

CVE-2026-5063

The NEX-Forms – Ultimate Forms Plugin for WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via POST parameter key names in the submit_nex_form() function in versions up to, and including, 9.1.11 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.

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Analysis

This is a stored cross-site scripting vulnerability in a specific WordPress plugin, NEX-Forms. While it allows unauthenticated attackers to inject scripts, the impact is isolated to users of this specific plugin and does not represent a systemic risk to the broader development ecosystem or core infrastructure.

Severity

Score: 7.2(HIGH)

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

AV: NETWORK

AC: LOW

PR: NONE

UI: NONE

S: CHANGED

C: LOW

I: LOW

A: NONE

Weakness (CWE): CWE-79

EPSS

Probability of exploitation (next 30 days): 0.0002 (0.0%)

Percentile: 6.6%

EPSS: 2026-05-06

Technical description

Published: 5/3/2026, 6:15:57 AM

Last modified: 5/5/2026, 7:13:44 PM

References

How to read this card

Actively exploited

KEV (Known Exploited Vulnerabilities) is CISA's catalog of CVEs confirmed as actively exploited in the real world. If a CVE is on KEV, someone is already using it in attacks.

CVSS 10.0

CVSS 10.0 — máxima severidad teórica. Explotable de forma remota, sin privilegios, con impacto total. Aún no confirmada como explotada en el mundo real, pero parchea ya.

AI-recommended

Un modelo de lenguaje revisó el CVE y consideró que afecta a software ampliamente desplegado o herramientas comunes de desarrollo. Un humano del equipo aprobó la publicación antes de que llegara aquí.

Categorías de impacto que evalúa la IA

widely_deployed_infra — kernel Linux, OpenSSL, glibc, k8s, Docker, nginx, OpenSSH.

popular_dev_tooling — Node.js, Python, Go, React, Next.js, librerías comunes de npm/pip.

common_consumer_software — Chrome, Firefox, Windows, macOS, apps móviles populares.

enterprise_saas — GitHub, GitLab, Atlassian, Salesforce, Cisco, Fortinet, Ivanti.

niche_software — CMS regionales, herramientas de hobby, librerías de poco uso.

not_relevant — firmware específico de proveedor, software descontinuado.

EPSS — EPSS (Exploit Prediction Scoring System) by FIRST.org estimates the probability that a CVE will be exploited in the next 30 days. Range is 0 to 1; very fresh CVEs typically score low until evidence accumulates.