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CVE-2026-86783— PostX < 5.0.41 - Unauthenticated Custom Field Key Disclosure via REST API

Quick assessment

Affected
Unknown Post Grid Gutenberg Blocks
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Post Grid Gutenberg Blocks WordPress 插件在 5.0.41 版本之前，未对返回指定帖子自定义字段键名的 REST API 路由执行身份验证或帖子可见性检查，从而导致未经身份认证的用户可以泄露任意帖子（包括私有、草稿、待审核、已定时发布以及密码保护的帖子）的自定义字段键名。

AI Predicted 5.3 Difficulty: Trivial EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1592 · Gather Victim Host Information

Affected Version Matrix 1

VendorProduct Version RangeStatus
Unknown Post Grid Gutenberg Blocks < 5.0.41 affected
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I. Basic Information for CVE-2026-86783

Vulnerability Information
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Vulnerability Title
PostX < 5.0.41 - Unauthenticated Custom Field Key Disclosure via REST API
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Unknown Post Grid Gutenberg Blocks 0 ~ 5.0.41 -

II. Public POCs for CVE-2026-86783

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III. Intelligence Information for CVE-2026-86783

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Other References for CVE-2026-86783 (1)

Same Patch Batch · Unknown · 2026-09-23 · 57 CVEs total

CVE-2026-86601 6.5 MEDIUM WP Recipe Maker < 10.8.2 - Unauthenticated Arbitrary Shortcode Execution via Comment Conte
CVE-2026-86612 5.6 MEDIUM Ninja Tables < 5.2.17 - Unauthenticated Arbitrary Shortcode Execution via Fluent Forms Dat
CVE-2026-84091 5.3 MEDIUM SUMIT Payment Gateway for WooCommerce < 4.0.0 - Unauthenticated Payment Confirmation Forge
CVE-2026-90950 5.3 MEDIUM Paid Member Subscriptions < 3.1.0 - Unauthenticated reCAPTCHA Bypass via Registration Form
CVE-2026-87978 5.3 MEDIUM Paymob for WooCommerce < 4.1.14 - Unauthenticated Payment Bypass via Unverified Subscripti
CVE-2026-87071 5.3 MEDIUM Forminator Forms < 1.57.2.1 - Unauthenticated Post Meta Injection on Submitted Posts
CVE-2026-87070 5.3 MEDIUM Forminator Forms < 1.57.2.1 - Unauthenticated Poll Vote Limit Bypass via IP Spoofing
CVE-2026-86604 4.8 MEDIUM GTranslate < 5.0.1 - Unauthenticated Arbitrary Shortcode Execution via Email Translation
CVE-2026-87848 3.7 LOW MPCX Lightbox 1.2.2 - 1.2.5 - Unauthenticated Non-Public Post Content Disclosure
CVE-2026-93511 Premium Packages < 7.2.1 - Unauthenticated PayPal Webhook Signature Verification Bypass
CVE-2026-87069 Forminator Forms < 1.57.2.1 - Subscriber+ Form Stripe Field Migration via migrate_stripe
CVE-2026-90985 WPC Smart Compare for WooCommerce < 6.6.1 - Unauthenticated Password-Protected Product Des
CVE-2026-91024 Booking Manager < 2.1.21 - Author+ SQLi via ICS Import Feed UID (sync_gid)
CVE-2026-89331 FluentBoards 1.95 - 2.0.15 - Unauthenticated Board Member Email Address Disclosure via Pub
CVE-2026-88997 JSM Show Post Metadata < 4.9.1 - Contributor+ Stored XSS via Custom Field Meta Key
CVE-2026-87981 Paymob for WooCommerce < 4.1.14 - Contributor+ Payment Gateway Configuration Deletion and
CVE-2026-87074 Forminator Forms < 1.57.2.1 - Unauthenticated Arbitrary Recipient Email Sending with Attac
CVE-2026-87979 Paymob for WooCommerce < 4.1.14 - Unauthenticated Saved Card Token Write to Any User via W
CVE-2026-88929 Sale Booster 7.0.0 - 7.5.1 - Unauthenticated Non-Public Product Disclosure
CVE-2026-86842 Real3D Flipbook Lite < 5.4 - Author+ Content Deletion and Stored XSS via Global Settings O

Showing top 20 of 57 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same vendor: Unknown

V. Comments for CVE-2026-86783

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