CVE-2026-96840 Post Grid Gutenberg Blocks – PostX - Stored Cross-Site Scripting

Post Grid Gutenberg Blocks – PostX plugin for WordPress <= 5.1.0 contains a stored cross-site scripting caused by insufficient sanitization of display_name user field, letting unauthenticated attackers inject scripts executed when users access injected pages.

CVSS base score 7.2 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.24% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Stored Cross-Site Scripting
Impact
Stored XSS
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Published
10 October 2026
Updated
15 October 2026
Weakness
CWE-79

Vendor fix

Update to a version later than 5.1.0 or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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