CVE-2026-54359
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk9th percentile - higher than 9% of all known CVEs
Summary
MISP contains an insecure default configuration where the Security.check_sec_fetch_site_header control is disabled. This allows remote unauthenticated attackers to send malicious requests to MISP automation endpoints on behalf of authenticated users.
Risk Assessment
An attacker could exploit this vulnerability to make unauthorized modifications to MISP data or configuration, potentially leading to serious security breaches within the organization.
Recommendation
It is recommended to enable the Security.check_sec_fetch_site_header option to mitigate the risk, however, operators of multi-homed MISP deployments should validate the setting before enforcing it.
Original NVD description (English source)
MISP contains an insecure default configuration in which the Security.check_sec_fetch_site_header control is disabled. When this setting is disabled, state-changing requests such as POST, PUT, or AJAX requests are not restricted based on the browser-provided Sec-Fetch-Site header. A remote unauthenticated attacker could craft a malicious web page that causes an authenticated MISP user’s browser to issue cross-site requests to MISP automation endpoints. If successful, the forged requests may be processed with the privileges of the victim user, potentially allowing unauthorized modification of MISP data or configuration. Enabling Security.check_sec_fetch_site_header mitigates this issue, although operators of multi-homed MISP deployments should validate the setting before enforcing it.