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

Authorization Bypass Through User-Controlled Key
CVE CVE-2026-1228
CVSS Medium (4.3)
Publicly Published February 5, 2026
Last Updated February 6, 2026
Researcher Kazuma Matsumoto
Description

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.

References

1 affected software package

Software Type Plugin
Software Slug timeline-block-block (view on wordpress.org)
Patched? Yes
Affected Version
  • <= 1.3.3
Patched Version
  • 1.3.4
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