Information disclosure in Headless Cms Plugin
CVE-2026-121509
A security flaw has been discovered in Headless CMS Plugin up to 2.0.4 on WordPress. This affects the function get_required_post_data of the file /wp-json/rae/v1/post of the component REST API. The manipulation of the argument post_id/post_slug results in information disclosure. The attack may be launched remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Headless Cms Plugin — versions 2.0.0, 2.0.1, 2.0.2
Weakness classification (CWE)
References
- vuldb.com/vuln/430285 (technical-description, vdb-entry)
- vuldb.com/vuln/430285/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-121509 (third-party-advisory)
- vuldb.com/submit/1019400 (third-party-advisory)
- app.notion.com/p/Unauthenticated-disclosure-of-draft-private-and-future-post-co… (exploit)
Frequently asked questions
- What is CVE-2026-121509?
- CVE-2026-121509 is a medium-severity vulnerability in Headless Cms Plugin, classified under Information Disclosure. CVSS score: 5.3/10. Published 2026-11-03.
- How severe is CVE-2026-121509?
- Medium severity. CVSS v3 base score is 5.3 out of 10.