Information disclosure in Headless CMS Plugin REST API post endpoint
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Information disclosure, Security bypass
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-200 and CWE-284.
Summary
Headless CMS Plugin up to and including 2.0.4 for WordPress is affected. The get_required_post_data function fails to restrict access, which exposes sensitive information to unauthorized actors (CWE-200). A remote attacker without privileges or user interaction can read this information by manipulating the post_id or post_slug argument. A public exploit has been released.
Written with Claude Haiku 5.5 from the sources below · 2026-11-03
Description from the CNA
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- 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 |
|---|---|---|---|---|---|
| — | Headless CMS Plugin | 2.0.0; 2.0.1; 2.0.2; 2.0.3; 2.0.4 | — | No fix listed | CNA |
- Headless CMS Plugin Vendor— Affected 2.0.0; 2.0.1; 2.0.2; 2.0.3; 2.0.4 Fixed in — No fix listed CNA
CPE names CNA · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:headless_cms_plugin:headless_cms_plugin:*:*:*:*:*:*:*:* | — | — | — |
- cpe:2.3:a:headless_cms_plugin:headless_cms_plugin:*:*:*:*:*:*:*:* Versions — — ·—
Remediation
The sources list no fixed version for Headless CMS Plugin.
Written with Claude Haiku 5.5 from the sources below · 2026-11-03
Timeline
- 2026-11-03 Threatist record created from CVE-2026-121509
- 2026-11-03 Alias added: GHSA-qp6v-4jg2-qc2c
- 2026-11-03 CISA SSVC decision points changed
- 2026-11-03 Priority changed: MEDIUM → HIGH
Sources
- CVE-2026-121509 · CVE Program
- CVE-2026-121509 · NVD
- FIRST EPSS
- GHSA-qp6v-4jg2-qc2c · 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