CVE-2026-15798: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in nextendweb Smart Slider 3
Description
Smart Slider 3 plugin for WordPress contains a stored cross-site scripting (XSS) vulnerability via the 'slider' block attribute in all versions up to and including 3.5.1.38. Authenticated users with contributor-level access or higher can inject malicious scripts that execute when the affected post is opened in the WordPress block editor, targeting editors and administrators.
CVSS v3.1
Score 6.4medium
Affected software
nextendweb
Smart Slider 3
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-15798 is a stored XSS vulnerability in the Smart Slider 3 WordPress plugin caused by insufficient input sanitization and output escaping of the 'slider' block attribute. This allows authenticated attackers with contributor or higher privileges to inject arbitrary scripts that execute in the context of users opening the affected post in the block editor. The vulnerability affects all versions up to and including 3.5.1.38.
Potential Impact
The vulnerability enables authenticated users with contributor-level access or above to inject malicious scripts that execute in the WordPress block editor when an affected post is opened. This can lead to unauthorized actions performed by editors or administrators, potentially compromising site integrity or user data confidentiality. There is no indication of impact on availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict contributor-level access and above to trusted users only to reduce risk. Monitor for updates from the vendor regarding patches or official mitigations.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-07-14T20:34:06.192Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a91179facd9273b496fd54f
Added to database: 08/28/2026, 05:07:43 UTC
Last enriched: 09/10/2026, 03:38:06 UTC
Last updated: 10/13/2026, 18:48:17 UTC
Views: 87
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