CVE-2026-1228 MEDIUM

CVE-2026-1228: Timeline Block <= 1.3.3 - Insecure Direct Object Reference to Authenticated (Author+) Private Timeline Exposure via Shortcode Attribute

Vendor Bplugins
Product Timeline Block – Beautiful Timeline Builder for WordPress (Vertical & Horizontal Timelines)
Weakness CWE-639 · IDOR
Published February 6, 2026
Last update April 8, 2026
View on NVD All CVEs

CVSS base score

4.3/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality Low
Integrity None

CVSS vector

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

What the vulnerability does

01Description

The Timeline Block – Beautiful Timeline Builder for WordPress (Vertical & Horizontal Timelines) plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 1.3.3 via the tlgb_shortcode() function due to missing validation on a user controlled key. This makes it possible for authenticated attackers, with Author-level access and above, to disclose private timeline content via the id attribute supplied to the 'timeline_block' shortcode.

Explanation of Vulnerability in Simple Terms

02Summary

The Timeline Block plugin for WordPress versions 1.3.3 and earlier contains an authorization flaw that allows authenticated users to access sensitive information they should not be able to view. The vulnerability requires a logged-in account but no additional user interaction. Site administrators should update to a version newer than 1.3.3 to prevent unauthorized data exposure.

What an attacker can do

03Attacker Capabilities

Read sensitive data they don't have permission to access.

Potential impact on your site

04Site Impact

Authenticated users can view private or restricted timeline data not intended for their access level.

Conditions required to exploit

05Prerequisites

Attacker must have a valid WordPress user account (any role).

Key dates

06Disclosure timeline

February 6, 2026 CVE published
April 8, 2026 Record updated