CVE-2025-63064 Overview
CVE-2025-63064 is a stored Cross-Site Scripting (XSS) vulnerability in the ashanjay EventON plugin for WordPress. The flaw affects all versions of EventON up to and including 4.9.12. Attackers with low-privileged authenticated access can inject malicious scripts that persist in the application and execute in the browsers of other users, including administrators. The vulnerability is classified under CWE-79 for improper neutralization of input during web page generation.
Critical Impact
Stored XSS in EventON enables authenticated attackers to persist malicious JavaScript that executes in the sessions of site visitors and administrators, leading to account takeover, content manipulation, and further compromise of the WordPress site.
Affected Products
- ashanjay EventON WordPress plugin versions through 4.9.12
- WordPress installations running the vulnerable EventON plugin
- All EventON deployments that accept event content from lower-privileged users
Discovery Timeline
- 2025-12-09 - CVE-2025-63064 published to the National Vulnerability Database
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-63064
Vulnerability Analysis
The vulnerability stems from improper neutralization of user-supplied input rendered in event-related output produced by the EventON plugin. Input submitted through plugin fields is stored in the WordPress database and later reflected into rendered pages without adequate sanitization or output encoding. When another user loads a page containing the stored payload, the injected script executes in that user's browser under the origin of the WordPress site.
Exploitation requires low privileges and user interaction, and the impact crosses a security boundary because scripts execute in the context of viewers who did not submit the input. Successful exploitation can lead to session hijacking, forced administrative actions via cross-site request forgery, arbitrary content injection, and pivoting to further plugin or site compromise.
Root Cause
The root cause is missing or insufficient input validation and output escaping in EventON code paths that handle event data. Fields intended for text content accept HTML and JavaScript payloads that are stored verbatim and later emitted into HTML contexts without functions such as esc_html, esc_attr, or wp_kses_post applied consistently.
Attack Vector
An authenticated attacker with contributor-level or similar permissions submits event data containing a JavaScript payload through plugin input fields. The payload is stored in the database and rendered when victims view affected event pages or administrative screens. See the Patchstack XSS Vulnerability Report for technical details.
// No verified proof-of-concept code is publicly available.
// The vulnerability manifests when unsanitized input in EventON event
// fields is rendered into HTML output consumed by other users.
Detection Methods for CVE-2025-63064
Indicators of Compromise
- Event records, titles, or descriptions containing <script> tags, javascript: URIs, or HTML event handlers such as onerror and onload
- Unexpected outbound requests from administrator browsers to attacker-controlled domains after viewing event pages
- New or modified WordPress administrator accounts following visits to EventON-rendered pages
- Suspicious posts, plugin changes, or option updates correlated with low-privileged user activity
Detection Strategies
- Query the wp_posts and wp_postmeta tables for EventON-related entries containing script tags or encoded JavaScript sequences
- Inspect HTTP responses from EventON pages for reflected payloads that were not encoded to safe HTML entities
- Correlate contributor or author account submissions with subsequent script execution errors in Content Security Policy reports
Monitoring Recommendations
- Enable and centralize WordPress audit logs covering post creation, updates, and metadata changes by non-administrator roles
- Deploy a Content Security Policy with reporting to surface inline script execution originating from stored payloads
- Monitor web application firewall telemetry for XSS signatures targeting EventON endpoints and administrator sessions
How to Mitigate CVE-2025-63064
Immediate Actions Required
- Update the EventON plugin to a version later than 4.9.12 as soon as a fixed release is available from the vendor
- Audit existing event records for stored HTML or JavaScript payloads and remove or sanitize offending content
- Review contributor, author, and editor accounts and revoke privileges that are not required
Patch Information
Refer to the Patchstack XSS Vulnerability Report for vendor patch status and upgrade guidance. Apply the fixed release across all WordPress instances that run EventON, then verify the plugin version reported in the WordPress admin dashboard matches the patched build.
Workarounds
- Restrict EventON event creation and editing to trusted administrator accounts until a patched version is deployed
- Deploy a web application firewall rule set that blocks common XSS payloads targeting WordPress plugin endpoints
- Enforce a strict Content Security Policy that disallows inline scripts on pages rendered by the EventON plugin
# Example WP-CLI commands to inventory and update the EventON plugin
wp plugin list --name=eventon --fields=name,status,version
wp plugin update eventon
wp plugin get eventon --field=version
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
