Ghost CMS: Incorrect authorization allows access to gated post content
Summary
Ghost versions 4.0.0 up to (but not including) 6.63.0 contain a flaw in the content API that does not correctly enforce access restrictions on gated posts. An unauthenticated visitor can query the content API directly to retrieve restricted post content, bypassing the paywall or members-only restrictions. No authentication or user interaction is required, and the attack is low complexity over the network.
Affected
- Ghost 4.0.0 up to (but not including) 6.63.0
- Self-hosted Ghost instances (Docker or Ghost-CLI) and vulnerable Ghost(Pro) instances, if the provider has not yet patched them
Fixed in
- Ghost 6.63.0 (vendor fix, per GHSA-rcx7-6m7p-xw5c)
Workaround
- Unknown. The vendor documents no workaround; the fix is to upgrade to 6.63.0 or later.
Exploitation
- No evidence of in-the-wild exploitation found; not listed in CISA KEV.
- No public proof-of-concept confirmed.
- CISA SSVC: exploitation none, automatable yes, technical impact partial.
- EPSS about 0.0038 (low predicted exploitation probability, per one aggregator).
Our recommendation
- Identify all Ghost instances, including test and forgotten ones, and their versions.
- Upgrade to Ghost 6.63.0 or later using the official Docker or Ghost-CLI update guidance.
- For hosted Ghost(Pro) instances, ask the provider about patch status.
- If gated content was sensitive, assess whether it was exposed before patching; review access logs where available.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- GitHub Security Advisory GHSA-rcx7-6m7p-xw5c github.com
- VulnCheck advisory: Ghost 4.0.0 before 6.63.0 Restricted Content Bypass www.vulncheck.com
- OSV: BIT-ghost-2026-103271 osv.dev
- CISA SSVC/KEV context (AA25-050A) www.cisa.gov
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 1 Nov 2026, 06:21.
Original description (NVD)
Ghost versions from 4.0.0 before 6.63.0 contain a content API vulnerability that allows unauthenticated visitors to access gated post content. Attackers can bypass content restrictions by directly querying the content API to retrieve restricted posts without authentication.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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