CVE-2026-6551
Stored XSS in Timeline Blocks Gutenberg Plugin Allows Script Injection
Publication date: 2026-04-28
Last updated on: 2026-04-28
Assigner: Wordfence
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| timeline_blocks | timeline_blocks | to 1.1.10 (inc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-79 | The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
The Timeline Blocks for Gutenberg plugin for WordPress has a Stored Cross-Site Scripting (XSS) vulnerability in the 'titleTag' attribute of the timeline-blocks/tb-timeline-blocks block.
This vulnerability exists in all versions up to and including 1.1.10 because the plugin does not properly sanitize or escape user-supplied input.
As a result, authenticated users with contributor-level access or higher can inject malicious scripts that execute whenever any user views the affected page.
How can this vulnerability impact me? :
This vulnerability allows attackers with contributor-level access or above to inject arbitrary web scripts into pages.
These scripts execute in the context of users who visit the infected pages, potentially leading to theft of user credentials, session hijacking, or other malicious actions.
Because the attack is stored, the malicious code persists and affects all users who access the compromised content.
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, you should update the Timeline Blocks for Gutenberg plugin to a version later than 1.1.10 where the issue is fixed.
Additionally, restrict contributor-level access and above to trusted users only, as the vulnerability requires authenticated users with such privileges to exploit.