CVE-2026-15402
Received Received - Intake

Stored XSS in Eventin WordPress Plugin via Schedule Slot Parameter

Publication date: 2026-09-15

Last updated on: 2026-09-15

Assigner: Wordfence

Description
The Eventin – Event Calendar, Event Registration, Tickets & Booking (AI Powered) plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'etn_shedule_objective' schedule_slot Parameter in all versions up to, and including, 4.1.23 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

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Meta Information

Published
2026-09-15
Last Modified
2026-09-15
Generated
2026-09-15
AI Q&A
2026-09-15
EPSS Evaluated
N/A
NVD
CVE-2026-15402
EUVD
EUVD-2026-78297

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
eventin event_calendar to 4.1.23 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This is a Stored Cross-Site Scripting (XSS) vulnerability in the Eventin WordPress plugin. It allows authenticated attackers with contributor-level access or higher to inject malicious scripts via the 'etn_shedule_objective' parameter in the schedule_slot field. The plugin fails to properly sanitize input and escape output, enabling script execution when users view infected pages.

Detection Guidance

Detection requires checking WordPress sites using the Eventin plugin up to version 4.1.23. Inspect plugin files for unsanitized input in the 'etn_shedule_objective' parameter. Review stored scripts in affected pages via admin dashboard or database queries.

Impact Analysis

If exploited, this vulnerability could allow attackers to steal user sessions, deface websites, or redirect visitors to malicious sites. It requires contributor-level access but could impact site visitors by compromising their data or experience.

Compliance Impact

This vulnerability could lead to data breaches, which may violate GDPR (if personal data is exposed) or HIPAA (if protected health information is compromised). Non-compliance risks fines and legal consequences depending on the data processed.

Mitigation Strategies

Update the Eventin plugin to the latest version beyond 4.1.23. Remove any injected scripts from pages and posts. Restrict contributor-level access to prevent unauthorized edits. Monitor for unusual activity in page content.

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