Input validation error in Ghost - CVE-2026-70595
Published: July 30, 2026 / Updated: August 6, 2026
Vulnerability identifier: #VU140548
CSH Severity: Low
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-70595
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to make limited HTTP requests to hosts in the server's internal network.
The vulnerability exists due to improper input validation in Webmentions functionality when handling user-supplied URLs. A remote attacker can submit a specially crafted request to make limited HTTP requests to hosts in the server's internal network.
No response data is returned to the requester.
Affected software
Ghost
How to mitigate CVE-2026-70595
Install security update from vendor's website.
Ghost - update to 6.54.1