PostX < 5.0.41 - Unauthenticated Custom Field Key Disclosure via REST API
Priority LOW 30CWE-200Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-200.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00345 28th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Post Grid Gutenberg Blocks (Unknown): 5.0.41
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Unknown | Post Grid Gutenberg Blocks | before 5.0.41 | 5.0.41 | Patch available | CNA |
- Post Grid Gutenberg Blocks VendorUnknown Affected before 5.0.41 Fixed in 5.0.41 Patch available CNA
Remediation
- Fix · CNA Post Grid Gutenberg Blocks (Unknown) Fixed in 5.0.41
Timeline
- 2026-10-02 Threatist record created from CVE-2026-86783
- 2026-10-03 Alias added: GHSA-f7w9-vf85-gjj5
References
Sources
- CVE-2026-86783 · CVE Program
- CVE-2026-86783 · NVD
- FIRST EPSS
- GHSA-f7w9-vf85-gjj5 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences