SB2026082165 - Multiple vulnerabilities in Ghost

Description

This security bulletin contains information about 3 vulnerabilities.

1) Incorrect authorization (CVE-ID: N/A)

CWE-ID: CWE-863 - Incorrect Authorization

CVSSv4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a remote user to modify posts beyond intended restrictions.

The vulnerability exists due to incorrect authorization in staff token handling when editing posts using a staff token. A remote user can use a staff token to modify posts beyond intended restrictions.

2) Missing Authorization (CVE-ID: N/A)

CWE-ID: CWE-862 - Missing Authorization

CVSSv4: 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]

The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to missing authorization in comment access controls when private mode is enabled and comments are requested. A remote attacker can access comments without authentication to disclose sensitive information.

3) Observable discrepancy (CVE-ID: N/A)

CWE-ID: CWE-203 - Observable discrepancy

CVSSv4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a remote user to disclose password hashes of other staff users.

The vulnerability exists due to observable discrepancy in the Ghost Admin API when handling staff-level administrative requests. A remote user can access crafted API interactions to disclose password hashes of other staff users.

An offline password-guessing attack against the disclosed hashes could lead to account takeover if successful, although device verification may prevent login with a recovered password.

Remediation

Install update from vendor's website.

References

• https://github.com/TryGhost/Ghost/security/advisories/GHSA-jj85-wvj2-r86m
• https://github.com/TryGhost/Ghost/security/advisories/GHSA-5ppm-p957-x46r
• https://github.com/TryGhost/Ghost/security/advisories/GHSA-ghq6-q78f-2cpg