TI-2026-65651 Aliases CVE-2026-103276 GHSA-v575-g66p-vj84

Ghost before 6.20.0 File Read via URL Encoding Bypass

LOW 36CWE-173Published 2026-10-01 · Updated 2026-10-01

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

Ghost versions before 6.20.0 contain a file extension filtering bypass vulnerability that allows unauthenticated attackers to read theme templates and metadata. Attackers can use URL encoding to bypass extension validation and access sensitive theme files.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00226 13th percentileScored 2026-11-07

Fix Fixed Ghost (TryGhost): 6.20.0

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

Vendor	Product	Affected versions	Fixed in	Status	Source
TryGhost	Ghost	before 6.20.0	6.20.0	Patch available	CNA

Ghost VendorTryGhost Affected before 6.20.0 Fixed in 6.20.0 Patch available CNA

CPE names Threatist (inferred) · 1

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

CPE	Versions	Role	Vendor
cpe:2.3:a:ghost:ghost::::::::	—	—	TryGhost

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

Remediation

Fix · CNA Ghost (TryGhost) Fixed in 6.20.0

Timeline

2026-10-02 Threatist record created from CVE-2026-103276
2026-10-03 Alias added: GHSA-v575-g66p-vj84

References

Advisory 1

GitHub Security Advisory (GHSA-6v8p-3jx9-8chr)

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