Improper Handling of Alternate Encoding in Ghost - CVE-2026-103276
Published: August 14, 2026 / Updated: October 1, 2026
Vulnerability identifier: #VU142539
CSH Severity: Medium
CVSS v4: 6.9 [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]
CVE-ID: CVE-2026-103276
CWE-ID: CWE-173
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to improper handling of alternate encoding in theme file serving when processing URL-encoded requests. A remote attacker can send a specially crafted request to disclose sensitive information.
The issue can expose theme templates and metadata.
Affected software
Ghost
How to mitigate CVE-2026-103276
Install security update from vendor's website.
Ghost - update to 6.20.0