The Post Grid Gutenberg Blocks for News, Magazines, Blog Websites – PostX plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 5.0.8 via the `/ultp/v3/starter_dummy_post/` and `/ultp/v3/starter_import_content/` REST API endpoints. This makes it possible for authenticated attackers, with Administrator-level access and above, to make web requests to arbitrary locations originating from the web application and can be used to query and modify information from internal services.
CVE-2026-1273 is a high severity with CVSS 7.2 Server-Side Request Forgery issue affecting the Plugin Post Grid Gutenberg Blocks for News, Magazines, Blog Websites – PostX. It affects Versions up to 5.0.8 and is fixed in 5.0.9.
CVE-2026-1273 is tracked for the Plugin Post Grid Gutenberg Blocks for News, Magazines, Blog Websites – PostX as high severity with CVSS 7.2. The affected range is Versions up to 5.0.8. Update Post Grid Gutenberg Blocks for News, Magazines, Blog Websites – PostX to 5.0.9 or newer where that version is compatible with the site.
| Software Type | Plugin |
|---|---|
| Software Slug |
ultimate-post
View on wordpress.org
|
| CVE | CVE-2026-1273 |
| Patched Versions |
5.0.9
|
| Affected Versions |
Versions up to 5.0.8
|
These internal links group the same WordPress plugin by CVE, issue type, severity, and patch status so operators and search engines can connect the full vulnerability cluster.
PostX <= 4.1.16 - Missing Authorization to Arbitrary Plugin Installation/Activation
Post Grid Gutenberg Blocks and WordPress Blog Plugin – PostX <= 4.1.2 - Missing Authorization to Arbitrary Options Update
Post Grid Gutenberg Blocks for News, Magazines, Blog Websites – PostX <= 5.0.3 - Missing Authorization to Unauthenticated Sensitive Information Exposure
PostX <= 4.1.35 - Authenticated (Editor+) Privilege Escalation
PostX – Gutenberg Blocks for Post Grid <= 2.9.9 - Unauthenticated Cross-Site Scripting
PostX - Gutenberg Blocks for Post Grid <= 2.4.9 - Unauthorized Access Controls
PostX <= 4.1.25 - Authenticated (Contributor+) Stored Cross-Site Scripting
PostX <= 4.1.15 - Authenticated (Contributor+) Stored Cross-Site Scripting
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