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TI-2026-38912 Aliases CVE-2026-53944GHSA-wvp2-4qqp-4h3r

Ghost: Private IP filtering bypass to make server-side requests to internal services

Priority LOW 32CWE-184Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

Ghost is a Node.js content management system. From 6.0.9 until 6.21.1, when making an external request, it is possible to bypass the IP filter that ensures the request isn't going to an internal service using an IPv6 literal which maps to a private IPv4 address. This vulnerability is fixed in 6.21.1.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00329 26th percentileScored 2026-11-07
Fix Fixed Ghost (TryGhost): 6.21.1ghost (npm): 6.21.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
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

VendorProductAffected versionsFixed inStatusSource
TryGhostGhost6.0.9 to before 6.21.16.21.1Patch availableCNA
—ghost (npm)6.0.9 to before 6.21.16.21.1Patch availableGHSA-wvp2-4qqp-4h3r
  • Ghost VendorTryGhost Affected 6.0.9 to before 6.21.1 Fixed in 6.21.1 Patch available CNA
  • ghost (npm) Vendor— Affected 6.0.9 to before 6.21.1 Fixed in 6.21.1 Patch available GHSA-wvp2-4qqp-4h3r

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:ghost:ghost:*:*:*:*:*:*:*:*——TryGhost
  • cpe:2.3:a:ghost:ghost:*:*:*:*:*:*:*:* Versions — — ·TryGhost

Remediation

  • Fix · CNA Ghost (TryGhost) Fixed in 6.21.1
  • Fix · GHSA-wvp2-4qqp-4h3r ghost (npm) Fixed in 6.21.1 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-53944
  2. 2026-10-03 Alias added: GHSA-wvp2-4qqp-4h3r

References

Advisory 1

Other 5

  • TI-2026-21459 Ghost has a SQL Injection in its Content API CVSS 3.1CRITICAL 9.4
  • TI-2022-10277 An arbitrary file upload vulnerability in the file upload module of Ghost v4.39.0 allows… CVSS 3.1CRITICAL 9.8
  • TI-2024-22785 Ghost through 5.85.1 allows remote attackers to bypass an authentication rate-limit… CVSS 3.1CRITICAL 9.1
  • TI-2023-14843 Ghost vulnerable to disclosure of private API fields CVSS 3.1HIGH 7.5
  • TI-2025-09049 Ghost 6.0.6 - SSRF via oEmbed Bookmark CVSS 4.0MEDIUM 6.1
  • TI-2023-20918 Arbitrary file read via symlinks in Ghost CVSS 3.1MEDIUM 6.5
See all 109 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences