CVE-2026-13253mediumCWE-79

CVE-2026-13253: medium-severity vulnerability in wpxpo Post Grid Gutenberg Blocks – PostX

Post Grid Gutenberg Blocks for News, Magazines, Blog Websites <= 5.0.31 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'moreResultsText' Block Attribute

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13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 6.4epss 0.4%
The Ultimate Post plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'moreResultsText' block attribute of the ultimate-post/advanced-search block in versions up to and including 5.0.31. This is due to insufficient input sanitization and output escaping in the Advanced_Search::content() render callback: the attribute value is filtered with wp_kses(), which strips disallowed HTML tags but does NOT escape HTML special characters such as double quotes in plain text, and the result is then concatenated directly into the data-viewmoretext HTML attribute without esc_attr(). 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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Affected products
wpxpo · Post Grid Gutenberg Blocks – PostX
Related CVEs — wpxpo Post Grid Gutenberg Blocks – PostX

In the same product, most dangerous first.

CVE-2026-15100MEDIUMPost Grid Gutenberg Blocks <= 5.0.32 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'searchnoresult' Block AttributeEPSS 0.3%CVE-2026-5158MEDIUMPostX <= 5.0.13 - Authenticated (Contributor+) Stored Cross-Site Scripting via Post Comments BlockEPSS 0.3%CVE-2026-96840HIGHPost Grid Gutenberg Blocks <= 5.1.0 - Unauthenticated Stored Cross-Site Scripting via display_name User FieldEPSS 0.2%