CVE-2026-15798Network attack vector

Stored script execution via slider block attribute

Published Aug 28, 2026 · Updated Aug 28, 2026

Stored XSS in Nextendweb Smart Slider 3 3.5.1.38 and earlier allows remote authenticated users to inject scripts through the slider block attribute. The slider block attribute is stored without sufficient input sanitization and emitted into the block editor without output escaping. Contributor-level access is required, and the payload runs when an Editor or Administrator opens the affected post in the WordPress block editor.

CVSS severity6.4
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Nextendweb Smart Slider 3 3.5.1.38 and earlier allows remote authenticated users to inject scripts through the slider block attribute. The slider block attribute is stored without sufficient input sanitization and emitted into the block editor without output escaping. Contributor-level access is required, and the payload runs when an Editor or Administrator opens the affected post in the WordPress block editor.

The record

CVE
CVE-2026-15798
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
Nextendweb
Product
Smart Slider 3
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=3.5.1.38

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Nextendweb · Smart Slider 3version=0 <=3.5.1.38

Published CVSS scores

6.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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