CVE-2026-54359 MISP automation endpoints may be exposed to CSRF when Sec-Fetch-Site protection is disabled by default
Attackers can perform unauthorized actions on MISP via CSRF due to disabled Sec-Fetch-Site checks, requiring configuration changes to mitigate.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-54359?
CVE-2026-54359 is a high-severity vulnerability in misp, published on 12 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Which versions are affected by CVE-2026-54359?
How do I fix CVE-2026-54359?
No fix has been published for CVE-2026-54359 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-54359 being exploited?
There is no known exploitation of CVE-2026-54359 in the wild and no public exploit code.
Sources
Also known as GHSA-g8rg-9w6v-v9gv.