SB2026010908 - Multiple vulnerabilities in Ghost

Description

This security bulletin contains information about 4 vulnerabilities.

1) SQL injection (CVE-ID: CVE-2026-22596)

CWE-ID: CWE-89 - Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote user to execute arbitrary SQL queries in database.

The vulnerability exists due to insufficient sanitization of user-supplied data in the /ghost/api/admin/members/events endpoint. A remote administrator can send a specially crafted request to the affected application and execute arbitrary SQL commands within the application database.

Successful exploitation of this vulnerability may allow a remote attacker to read, delete, modify data in database and gain complete control over the affected application.

2) Incorrect authorization (CVE-ID: CVE-2026-22595)

CWE-ID: CWE-863 - Incorrect Authorization

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to bypass authorization checks.

The vulnerability exists due to Staff Token authentication bypass. A remote user can gain access to the target application.

3) Improper Authentication (CVE-ID: CVE-2026-22594)

CWE-ID: CWE-287 - Improper Authentication

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error within 2FA mechanism. A remote user can skip email 2FA.

4) Server-Side Request Forgery (SSRF) (CVE-ID: CVE-2026-22597)

CWE-ID: CWE-918 - Server-Side Request Forgery (SSRF)

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The disclosed vulnerability allows a remote user to perform SSRF attacks.

The vulnerability exists due to insufficient validation of user-supplied input within media inliner mechanism. A remote administrator can send a specially crafted HTTP request and trick the application to initiate requests to arbitrary systems.

Successful exploitation of this vulnerability may allow a remote attacker gain access to sensitive data, located in the local network or send malicious requests to other servers from the vulnerable system.

Remediation

Install update from vendor's website.

References

• https://github.com/TryGhost/Ghost/security/advisories/GHSA-gjrp-xgmh-x9qq
• https://github.com/TryGhost/Ghost/security/advisories/GHSA-9xg7-mwmp-xmjx
• https://github.com/TryGhost/Ghost/security/advisories/GHSA-5fp7-g646-ccf4
• https://github.com/TryGhost/Ghost/security/advisories/GHSA-vmc4-9828-r48r