CVE-2026-4920 MEDIUM

CVE-2026-4920: Next Date <= 1.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'default' Shortcode Attribute

Vendor Jeremyshapiro
Product Next Date
Weakness CWE-79 · XSS
Published May 12, 2026
Last update May 13, 2026
View on NVD All CVEs

CVSS base score

6.4/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

What the vulnerability does

01Description

The Next Date plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'default' shortcode attribute in all versions up to, and including, 1.0 due to insufficient input sanitization and output escaping on user supplied attributes. 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.

Explanation of Vulnerability in Simple Terms

02Summary

Next Date versions 1.0 and earlier contain a cross-site scripting (XSS) vulnerability that allows authenticated users to inject malicious scripts affecting other users. The vulnerability has scope change, meaning the impact extends beyond the vulnerable component itself. Low-privileged accounts can exploit this without user interaction.

What an attacker can do

03Attacker Capabilities

Inject malicious scripts that execute in other users' browsers and affect site functionality.

Potential impact on your site

04Site Impact

Authenticated users can inject scripts affecting other users' sessions and data integrity.

Conditions required to exploit

05Prerequisites

Attacker must have a low-privilege account; no user interaction required from victims.

Key dates

06Disclosure timeline

May 12, 2026 CVE published
May 13, 2026 Record updated