Information Disclosure Vulnerability in Headless CMS Plugin for WordPress
CVE-2026-121509

6.9MEDIUM

Key Information:

Vendor

WordPress
Status
Headless Cms Plugin
Vendor
CVE Published:
3 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-121509?

A security flaw in the Headless CMS Plugin for WordPress, specifically affecting versions up to 2.0.4, has been identified. This vulnerability resides in the get_required_post_data function within the REST API component, located at /wp-json/rae/v1/post. By manipulating the post_id or post_slug parameters, unauthorized users may gain access to sensitive information. The exploit can be executed remotely, posing a significant risk to WordPress installations using this plugin. Despite early notification of the vulnerability to the vendor, no response has been received.

Affected Version(s)

Headless CMS Plugin 2.0.0

Headless CMS Plugin 2.0.1

Headless CMS Plugin 2.0.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-121509 - Proof of Concept

References

https://vuldb.com/vuln/430285
vdb-entrytechnical-description
https://vuldb.com/vuln/430285/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-121509
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Rony Ahmed (VulDB User)
VulDB CNA Team
.