CVE-2026-28099
Published: 05 March 2026
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 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-2026-28099 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.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-9754
Vulnerability details
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.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
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).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires validation and neutralization of untrusted input before web page generation, blocking the reflected XSS payload in uberSlider_ultra.
Requires filtering of information outputs to remove or encode script content, preventing execution of attacker-injected JavaScript in the victim's browser context.
Provides mechanisms to detect and block malicious code (scripts) delivered via web requests or responses, mitigating exploitation of the unsanitized input.