Cyber Resilience

CVE-2026-28103

High

Published: 05 March 2026

Published
05 March 2026
Modified
22 April 2026
KEV Added
—
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-2026-28103 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-2026-28103 is an Improper Neutralization of Input During Web Page Generation vulnerability, classified as Reflected Cross-Site Scripting (XSS) under CWE-79, affecting the LBG Zoominoutslider WordPress plugin developed by LambertGroup. The issue impacts all versions of the plugin up to and including 5.4.5, as published on 2026-03-05. It has 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 high severity due to network accessibility, low attack complexity, and changed scope.

Attackers can exploit this vulnerability remotely without authentication by tricking authenticated users into interacting with maliciously crafted links or inputs that reflect executable scripts on the affected WordPress site. Successful exploitation enables limited impacts on confidentiality, integrity, and availability, such as potential session hijacking, data theft from the victim's browser context, or minor disruptions, leveraging the changed scope to affect site users.

Patchstack's advisory at https://patchstack.com/database/Wordpress/Plugin/lbg_zoominoutslider/vulnerability/wordpress-lbg-zoominoutslider-plugin-5-4-5-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve provides details on the vulnerability in the WordPress LBG Zoominoutslider plugin version 5.4.5, recommending updates to patched versions where available or alternative mitigations for site administrators.

EU & UK References

Vulnerability details

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in LambertGroup LBG Zoominoutslider lbg_zoominoutslider allows Reflected XSS.This issue affects LBG Zoominoutslider: from n/a through <= 5.4.5.

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 →
T1185 Browser Session Hijacking Collection
Adversaries may take advantage of security vulnerabilities and inherent functionality in browser software to change content, modify user-behaviors, and intercept information as part of various browser session hijacking techniques.
attack.mitre.org →
T1539 Steal Web Session Cookie Credential Access
An adversary may steal web application or service session cookies and use them to gain access to web applications or Internet services as an authenticated user without needing credentials.
attack.mitre.org →
T1059.007 JavaScript Execution
Adversaries may abuse various implementations of JavaScript for execution.
attack.mitre.org →
Why these techniques?

Reflected XSS in public-facing WordPress plugin enables remote exploitation via crafted links (T1190), direct browser session hijacking and web cookie theft in authenticated user context (T1185, T1539), and arbitrary JavaScript execution (T1059.007).

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

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CVE-2026-27352Shared CWE-79

Affected Assets

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match
prevent

Directly requires validation and neutralization of untrusted input before it is reflected into web page output, blocking the reflected XSS payload at its source.

SI-15 Information Output Filtering good match
prevent

Requires filtering or encoding of information returned to users, preventing executable scripts from being reflected in responses to crafted links.

SC-18 Mobile Code partial match
prevent

Limits or inspects mobile code (e.g., JavaScript) delivered via web pages, reducing the ability of reflected XSS to execute in the victim's browser context.

References