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The vulnerability tracked as CVE-2026-105681 is an input validation flaw located within the Ghost publishing platform. Specifically, the comment querying subsystem fails to sanitize and validate input parameters passed by authenticated members during API interactions.
In vulnerable versions ranging from v5.9.0 up to v6.44.1, the Ghost backend handles comment retrieval requests via MongoDB / Ghost Content API queries. When a member requests comments, the backend relies on user-controlled parameters (such as `post_id` or query filter objects) to restrict output to authorized resources. Due to improper neutralization of special elements in query data structures (NoSQL injection / logic bypass), an attacker can supply manipulated JSON payload objects instead of expected string identifiers.
By crafting query filters using comparison operators like `$ne` (not equal), an authenticated low-privilege member can bypass access control checks. This causes the database query to return comments associated with restricted or private posts across the platform. The issue resides purely in server-side authorization validation prior to query execution. Because the backend trusts client-supplied parameters without strict schema enforcement, unauthorized data retrieval occurs while bypassing membership visibility constraints. Patched releases enforce strict input sanitization and schema checking on all comment query filters.
DailyCVE Form:
Platform: Ghost CMS
Version: v5.9.0-v6.44.1
Vulnerability: Input Validation Bypass
Severity: Medium (6.5)
date: 2026-10-05
Prediction: Released (v6.44.1)
What Undercode Say
Analytics
The vulnerability stems from improper neutralization of operator objects in data queries (CWE-943 / NoSQL Injection). Attacking the Ghost Comments API allows authenticated users with standard member permissions to pull comments across private tiers.
Verify installed Ghost CLI and instance version ghost version Fetch comments bypassing post boundary via JSON filter payload curl -X GET "https://target-ghost-site.com/ghost/api/content/comments/?filter=post_id:\$ne:null" \ -H "Authorization: Bearer <MEMBER_JWT_TOKEN>" \ -H "Content-Type: application/json"
// Vulnerable Server-side Query Logic Example (Pre-patch)
async function getCommentsForMember(req, res) {
const filterParam = req.query.filter; // Unsanitized input directly passed to query parser
// Insecure query construction allows object operator injection
const comments = await models.Comment.findPage({
filter: filterParam
});
return res.json({ comments });
}
How Exploit: (Educational Purposes!)
- Authenticate to the vulnerable Ghost instance as a standard registered member.
- Intercept comment API fetch requests using an HTTP proxy.
- Inject NoSQL operator logic into the comment query parameter (e.g., replacing standard `post_id` matching with `$ne` operators).
- Transmit the modified request to the Ghost endpoint.
- Inspect the HTTP response to view private or unauthorized post comments returned by the backend.
Protection: from this CVE
Upgrade Ghost to version v6.44.1 or higher immediately.
For Docker deployments, pull the updated container image: `docker pull ghost:6.44.1` and restart containers.
For Ghost-CLI setups, run `ghost update` inside the root installation directory.
Apply strict input validation filters at the Web Application Firewall (WAF) layer to block object/operator injection in query strings.
Impact
An input validation issue allowed authenticated members to access comments on posts they were not authorized to access, resulting in unauthorized data exposure.
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Sources:
Reported By: github.com
Extra Source Hub:
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