CVE-2026-103276

medium

Description

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.

References

https://www.vulncheck.com/advisories/ghost-before-6.20.0-file-read-via-url-encoding-bypass

https://github.com/TryGhost/Ghost/security/advisories/GHSA-6v8p-3jx9-8chr

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-90669

Details

Source: Mitre, NVD

Published: 2026-10-01

Updated: 2026-10-01

Risk Information

CVSS v2

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N

Severity: Medium

CVSS v3

Base Score: 5.3

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Severity: Medium

CVSS v4

Base Score: 6.9

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Severity: Medium

EPSS

EPSS: 0.00226