CVE-2026-26980: Ghost CMS Information Disclosure Flaw

CVE-2026-26980 Overview

CVE-2026-26980 is a SQL Injection vulnerability affecting Ghost, a popular Node.js content management system. The vulnerability exists in the Content API's slug filter ordering functionality, allowing unauthenticated attackers to perform arbitrary reads from the database. This flaw impacts versions 3.24.0 through 6.19.0 and has been addressed in version 6.19.1.

Critical Impact

Unauthenticated attackers can exploit this SQL injection vulnerability to extract sensitive data from the Ghost database, potentially compromising user credentials, authentication tokens, and site content without requiring any authentication.

Affected Products

• Ghost CMS versions 3.24.0 through 6.19.0
• Ghost installations running on Node.js platforms
• Self-hosted and managed Ghost deployments within the vulnerable version range

Discovery Timeline

• 2026-02-20 - CVE-2026-26980 published to NVD
• 2026-02-20 - Last updated in NVD database

Technical Details for CVE-2026-26980

Vulnerability Analysis

This SQL Injection vulnerability (CWE-89) resides in Ghost's Content API slug filter ordering mechanism. The vulnerable code directly concatenates user-supplied slug values into SQL CASE statements without proper sanitization or parameterization. This allows attackers to inject arbitrary SQL syntax through the ordering parameter, enabling unauthorized database reads.

The vulnerability is particularly dangerous because it requires no authentication—any external attacker with network access to a Ghost instance can exploit this flaw to extract sensitive information from the underlying database.

Root Cause

The root cause is improper input validation in the slug-filter-order.js utility. The original implementation directly embedded user-supplied slug values into raw SQL strings using string interpolation:

order += `WHEN \`${table}\`.\`slug\` = '${slug}' THEN ${index} `;

This pattern allows attackers to break out of the string context and inject malicious SQL commands. The lack of parameterized queries or prepared statements creates a classic SQL injection attack surface.

Attack Vector

The attack exploits the Content API's ordering functionality through network requests. An attacker can craft malicious slug values containing SQL syntax that, when processed by the vulnerable code, execute unintended database operations. Since the vulnerability is accessible without authentication and exploitable over the network, attackers can remotely extract database contents including potentially sensitive user information, API keys, and site configuration data.

// Vulnerable code (before patch) - Source: https://github.com/TryGhost/Ghost/commit/30868d632b2252b638bc8a4c8ebf73964592ed91
 
     if (orderMatch) {
         let orderSlugs = orderMatch[1].split(',');
-        let order = 'CASE ';
+        let caseParts = [];
+        let bindings = [];
 
         orderSlugs.forEach((slug, index) => {
-            order += `WHEN \`${table}\`.\`slug\` = '${slug}' THEN ${index} `;
+            caseParts.push(`WHEN \`${table}\`.\`slug\` = ? THEN ?`);
+            bindings.push(slug.trim(), index);
         });
 
-        order += 'END ASC';
-
-        return order;
+        return {
+            sql: `CASE ${caseParts.join(' ')} END ASC`,
+            bindings
+        };
     }
 };

The patch replaces string concatenation with parameterized bindings, ensuring user input is properly escaped and treated as data rather than SQL code.

Detection Methods for CVE-2026-26980

Indicators of Compromise

• Unusual or malformed requests to Ghost Content API endpoints containing SQL syntax in ordering parameters
• Database query logs showing unexpected UNION, SELECT, or other SQL keywords within slug filter operations
• Anomalous database access patterns or queries accessing tables outside normal Ghost operations
• Error logs indicating SQL syntax errors from malformed injection attempts

Detection Strategies

• Monitor Content API request logs for suspicious ordering parameters containing SQL keywords or special characters
• Implement Web Application Firewall (WAF) rules to detect SQL injection patterns in API requests
• Enable database query logging and alert on queries containing unexpected SQL constructs within CASE statements
• Deploy intrusion detection signatures for common SQL injection payloads targeting the slug filter endpoint

Monitoring Recommendations

• Configure alerting for failed or anomalous database queries originating from the Ghost application
• Monitor for bulk data exfiltration patterns that may indicate successful exploitation
• Track access to sensitive database tables (users, api_keys, settings) for unauthorized read operations
• Implement rate limiting on Content API endpoints to slow down automated exploitation attempts

How to Mitigate CVE-2026-26980

Immediate Actions Required

• Upgrade Ghost CMS to version 6.19.1 or later immediately
• Review database access logs for signs of exploitation prior to patching
• Audit any exposed Ghost instances for suspicious API activity
• Consider temporarily restricting access to the Content API if immediate patching is not possible

Patch Information

Ghost has released version 6.19.1 which addresses this vulnerability by implementing parameterized queries for the slug filter ordering functionality. The fix ensures user-supplied values are properly bound as parameters rather than concatenated into SQL strings. For detailed technical information, review the GitHub Security Advisory GHSA-w52v-v783-gw97 and the GitHub Commit Update.

Workarounds

• Deploy a Web Application Firewall (WAF) with SQL injection detection rules in front of Ghost instances
• Restrict network access to Ghost Content API endpoints to trusted IP ranges where possible
• Implement additional input validation at the reverse proxy or load balancer level
• Monitor and rate-limit requests to the Content API to reduce exploitation risk

# Upgrade Ghost to patched version
ghost update

# Verify installed version
ghost version
# Expected output: Ghost-CLI version: x.x.x / Ghost version: 6.19.1 (or later)