CVE-2026-53945: CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition in TryGhost Ghost
Ghost is a Node.js content management system. From 6.0.9 until 6.21.1, Ghost’s private-IP check for outbound HTTP requests could be bypassed via DNS rebinding, allowing an attacker to coerce the Ghost server into reaching hosts on internal networks through features that issue external fetches. This vulnerability is fixed in 6.21.1.
AI Analysis
Technical Summary
CVE-2026-53945 describes a TOCTOU race condition vulnerability in Ghost versions >=6.0.9 <6.21.1 where the private-IP check for outbound HTTP requests can be bypassed through DNS rebinding. This allows an attacker to coerce the Ghost server into making requests to internal network hosts via features that issue external fetches. The vulnerability is resolved in version 6.21.1. The CVSS 3.1 vector indicates network attack vector, high attack complexity, no privileges required, no user interaction, scope changed, no confidentiality impact, low integrity impact, and no availability impact.
Potential Impact
An attacker can bypass the private-IP check via DNS rebinding, potentially causing the Ghost server to reach internal network hosts that should be inaccessible externally. This could lead to limited integrity impact due to unauthorized interactions with internal services. There is no direct confidentiality or availability impact reported. The vulnerability affects the trust boundary of outbound HTTP requests in Ghost.
Mitigation Recommendations
A fix is available in Ghost version 6.21.1. Users should upgrade to version 6.21.1 or later to remediate this vulnerability. No additional mitigation guidance is provided or required beyond applying the official fix.
CVE-2026-53945: CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition in TryGhost Ghost
Description
Ghost is a Node.js content management system. From 6.0.9 until 6.21.1, Ghost’s private-IP check for outbound HTTP requests could be bypassed via DNS rebinding, allowing an attacker to coerce the Ghost server into reaching hosts on internal networks through features that issue external fetches. This vulnerability is fixed in 6.21.1.
CVSS v3.1
Score 4.0medium
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-53945 describes a TOCTOU race condition vulnerability in Ghost versions >=6.0.9 <6.21.1 where the private-IP check for outbound HTTP requests can be bypassed through DNS rebinding. This allows an attacker to coerce the Ghost server into making requests to internal network hosts via features that issue external fetches. The vulnerability is resolved in version 6.21.1. The CVSS 3.1 vector indicates network attack vector, high attack complexity, no privileges required, no user interaction, scope changed, no confidentiality impact, low integrity impact, and no availability impact.
Potential Impact
An attacker can bypass the private-IP check via DNS rebinding, potentially causing the Ghost server to reach internal network hosts that should be inaccessible externally. This could lead to limited integrity impact due to unauthorized interactions with internal services. There is no direct confidentiality or availability impact reported. The vulnerability affects the trust boundary of outbound HTTP requests in Ghost.
Mitigation Recommendations
A fix is available in Ghost version 6.21.1. Users should upgrade to version 6.21.1 or later to remediate this vulnerability. No additional mitigation guidance is provided or required beyond applying the official fix.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-11T15:50:01.281Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a3c2387748d17fc4ff2f766
Added to database: 06/24/2026, 18:35:51 UTC
Last enriched: 07/01/2026, 22:40:27 UTC
Last updated: 08/08/2026, 13:38:28 UTC
Views: 56
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