PatchSiren cyber security CVE debrief
CVE-2026-8703 codycave CVE debrief
CVE-2026-8703 is a stored cross-site scripting (XSS) vulnerability in the Endless Scroll plugin for WordPress, affecting all versions up to and including 1.0.0. The flaw stems from insufficient input sanitization and output escaping within shortcode attributes, allowing authenticated attackers with contributor-level access or higher to inject arbitrary web scripts into pages. These scripts execute whenever a user accesses an injected page. The vulnerability was published on May 27, 2026, and carries a CVSS 3.1 score of 6.4 (Medium severity). The attack vector is network-based, requires low attack complexity, and low privileges, with no user interaction needed. The scope is changed, with low impacts on confidentiality and integrity, and no availability impact. The weakness is categorized as CWE-79 (Improper Neutralization of Input During Web Page Generation).
- Vendor
- codycave
- Product
- Endless Scroll
- CVSS
- MEDIUM 6.4
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-05-27
- Original CVE updated
- 2026-05-27
- Advisory published
- 2026-05-27
- Advisory updated
- 2026-05-27
Who should care
WordPress site administrators using the Endless Scroll plugin; security teams managing WordPress installations; developers maintaining WordPress plugins with shortcode functionality
Technical summary
The Endless Scroll plugin for WordPress fails to properly sanitize and escape input within shortcode attributes, resulting in a stored XSS vulnerability. The affected code resides in index.php at lines 54 and 58 of the plugin trunk. Authenticated users with contributor privileges or higher can exploit this by crafting malicious shortcode attributes that persist in page content. When subsequent users view the affected pages, the injected scripts execute in their browser context. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N reflects network accessibility, low complexity, low privilege requirements, no user interaction, changed scope, and limited confidentiality and integrity impacts with no availability impact.
Defensive priority
medium
Recommended defensive actions
- Update the Endless Scroll WordPress plugin to a version newer than 1.0.0 when available, or remove the plugin if no patch is released
- Review existing posts and pages for unauthorized shortcode usage by contributor-level users or higher
- Implement Content Security Policy (CSP) headers to mitigate impact of potential XSS payloads
- Enable WordPress automatic updates for plugins to reduce exposure window for future vulnerabilities
- Audit user roles and permissions to ensure contributor access is granted only to trusted users
- Consider implementing additional output escaping for shortcode attributes in custom code if maintaining a fork
Evidence notes
Vulnerability confirmed via Wordfence security advisory and WordPress plugin repository source code references. The flaw exists in the Endless Scroll plugin's shortcode handling at lines 54 and 58 of index.php in the trunk version.
Official resources
2026-05-27