Cyber Posture

CVE-2026-28099

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 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 11.8th percentile
Risk Priority 14 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-28099 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 JavaScript (T1059.007); ranked at the 11.8th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

Threat & Defense at a Glance

What attackers do: exploitation maps to JavaScript (T1059.007) and 2 other techniques.
Threat & Defense Details

Likely Mitigating ControlsAI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

CA-8 Penetration Testing
addresses: CWE-79

Penetration testing submits XSS payloads to web applications, detecting cross-site scripting flaws for subsequent remediation.

SI-10 Information Input Validation
addresses: CWE-79

Validates web inputs to reject script-related content that could produce XSS.

SI-15 Information Output Filtering
addresses: CWE-79

Output validation against expected content can reject or sanitize script content in generated web pages, reducing XSS exploitability.

MITRE ATT&CK Enterprise TechniquesAI

T1059.007 JavaScript Execution
Adversaries may abuse various implementations of JavaScript for execution.
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 →
Why these techniques?

Reflected XSS directly enables arbitrary JavaScript execution in browser (T1059.007) leading to session hijacking (T1185) and web session cookie theft (T1539).

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

NVD Description

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in LambertGroup UberSlider Ultra uberSlider_ultra allows Reflected XSS.This issue affects UberSlider Ultra: from n/a through <= 2.3.

Deeper analysisAI

CVE-2026-28099 is an improper neutralization of input during web page generation vulnerability, classified as reflected cross-site scripting (XSS) under CWE-79, in the LambertGroup UberSlider Ultra (uberSlider_ultra) WordPress plugin. This issue affects versions from n/a through 2.3 inclusive. The vulnerability was published on 2026-03-05 with 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).

Attackers can exploit this vulnerability remotely over the network with low complexity and no required privileges, though it necessitates user interaction such as clicking a malicious link or visiting a crafted page. Successful exploitation allows injection and execution of arbitrary JavaScript in the context of the victim's browser, potentially leading to theft of session cookies, defacement of the page, or other client-side attacks, with low impacts on confidentiality, integrity, and availability but a changed scope.

The Patchstack advisory provides details on this WordPress plugin vulnerability, including assessment and recommendations for mitigation.

Details

CWE(s)
CWE-79

CVEs Like This One

CVE-2026-23525Shared CWE-79
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CVE-2026-28756Shared CWE-79
CVE-2025-69386Shared CWE-79
CVE-2025-0828Shared CWE-79
CVE-2025-0598Shared CWE-79
CVE-2026-31281Shared CWE-79
CVE-2025-0833Shared CWE-79

References