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Vulnerability details

CVE-2026-96840

wpxpo Post Grid Gutenberg Blocks – PostX

Post Grid Gutenberg Blocks <= 5.1.0 - Unauthenticated Stored Cross-Site Scripting via display_name User Field

CVSS 3.1
7.2High

Official description

The Post Grid Gutenberg Blocks – PostX plugin for WordPress is vulnerable to Stored Cross-Site Scripting via display_name User Field in all versions up to, and including, 5.1.0 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. WordPress core's pre_user_display_name filter encodes &, <, and > but leaves double-quotes intact (ENT_NOQUOTES), allowing a Subscriber-level user to store a double-quote in their display_name via /wp-admin/profile.php that subsequently breaks out of the alt="" attribute at Archive_Title.php:144.

CVSS scores

ScoreVersionSourceVector
7.2High 3.1 CVEProject cvelistV5 (CNA) (Wordfence) CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Affected products

VendorProductVersionsSource
wpxpo Post Grid Gutenberg Blocks – PostX v ≤ 5.1.0 CVEProject cvelistV5 (CNA)

References and advisories

5
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Details

Published
2026-10-10
Last updated
2026-10-11
State
Published
Assigner (CNA)
Wordfence

Exploit prediction (EPSS)

0.23%
Probability of exploitation in 30 days
14.7%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
None
Technical impact
Partial

Weaknesses (CWE)

  • CWE-79
    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')