CVE-2026-86783: CWE-200 Information Exposure in Post Grid Gutenberg Blocks
The Post Grid Gutenberg Blocks WordPress plugin before 5.0.41 does not perform an authorization or post-visibility check on a REST API route that returns the custom field keys of a given post, allowing unauthenticated users to disclose the custom field key names of arbitrary posts, including private, draft, pending, scheduled and password-protected posts.
AI Analysis
Technical Summary
CVE-2026-86783 is an information exposure vulnerability (CWE-200) in the Post Grid Gutenberg Blocks WordPress plugin versions prior to 5.0.41. The plugin fails to enforce authorization or visibility checks on a REST API endpoint that returns custom field keys for posts. Consequently, unauthenticated attackers can retrieve the names of custom fields from any post, including those not publicly visible, potentially leaking sensitive metadata.
Potential Impact
An attacker can disclose the names of custom fields associated with any post, including private, draft, pending, scheduled, and password-protected posts. While this does not directly expose post content, the leakage of custom field keys may reveal sensitive information about the site's data structure or confidential metadata, which could aid further attacks or information gathering.
Mitigation Recommendations
Upgrade the Post Grid Gutenberg Blocks plugin to version 5.0.41 or later, where this vulnerability is fixed. No other mitigations are indicated. Patch status is confirmed by the version boundary in the affectedVersions field.
CVE-2026-86783: CWE-200 Information Exposure in Post Grid Gutenberg Blocks
Description
The Post Grid Gutenberg Blocks WordPress plugin before 5.0.41 does not perform an authorization or post-visibility check on a REST API route that returns the custom field keys of a given post, allowing unauthenticated users to disclose the custom field key names of arbitrary posts, including private, draft, pending, scheduled and password-protected posts.
CVSS v3.1
Score 5.3medium
Affected software
Post Grid Gutenberg Blocks
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-86783 is an information exposure vulnerability (CWE-200) in the Post Grid Gutenberg Blocks WordPress plugin versions prior to 5.0.41. The plugin fails to enforce authorization or visibility checks on a REST API endpoint that returns custom field keys for posts. Consequently, unauthenticated attackers can retrieve the names of custom fields from any post, including those not publicly visible, potentially leaking sensitive metadata.
Potential Impact
An attacker can disclose the names of custom fields associated with any post, including private, draft, pending, scheduled, and password-protected posts. While this does not directly expose post content, the leakage of custom field keys may reveal sensitive information about the site's data structure or confidential metadata, which could aid further attacks or information gathering.
Mitigation Recommendations
Upgrade the Post Grid Gutenberg Blocks plugin to version 5.0.41 or later, where this vulnerability is fixed. No other mitigations are indicated. Patch status is confirmed by the version boundary in the affectedVersions field.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-09-08T11:48:34.198Z
- State
- PUBLISHED
Threat ID: 6ab36d42f7a7c541065abcb3
Added to database: 09/23/2026, 06:10:10 UTC
Last enriched: 09/23/2026, 06:18:56 UTC
Last updated: 09/24/2026, 01:57:05 UTC
Views: 7
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