CVE-2026-28037

High

Published: 05 March 2026

Published

05 March 2026

Modified

22 April 2026

KEV Added

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Patch

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CVSS Score v3.1 7.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

EPSS Score 0.0004 14.4th percentile

Risk Priority 14 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-28037 is a high-severity Cross-site Scripting (CWE-79) vulnerability. Its CVSS base score is 7.1 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 14.4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-15 (Information Output Filtering).

Deeper analysis

CVE-2026-28037 is an Improper Neutralization of Input During Web Page Generation vulnerability, enabling Reflected Cross-site Scripting (XSS) as classified under CWE-79. It affects the EventON WordPress plugin by ashanjay, with the issue present in versions from n/a through 4.9.12.

The vulnerability carries a CVSS v3.1 base score of 7.1 (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L), indicating network accessibility, low attack complexity, no required privileges, but necessitating user interaction. Remote attackers can exploit it by tricking authenticated or unauthenticated users into interacting with malicious input, such as via a crafted link or payload reflected in web page generation. Exploitation achieves low impacts on confidentiality, integrity, and availability within a changed scope.

The Patchstack advisory at https://patchstack.com/database/Wordpress/Plugin/eventon/vulnerability/wordpress-eventon-plugin-4-9-12-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve provides details on this Reflected XSS vulnerability in the WordPress EventON plugin version 4.9.12. Security practitioners should consult it for recommended mitigations, such as applying available patches or updates.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-9699

Vulnerability details

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in ashanjay EventON eventon allows Reflected XSS.This issue affects EventON: from n/a through <= 4.9.12.

CWE(s): CWE-79

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1059.007 JavaScript Execution

Adversaries may abuse various implementations of JavaScript for execution.

attack.mitre.org →

Why these techniques?

Reflected XSS (CWE-79) in public-facing WordPress plugin directly enables remote exploitation of the web application (T1190) via crafted links/payloads and facilitates arbitrary JavaScript execution in the victim browser (T1059.007).

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1