CVE-2026-90893 MISP UserSettingsController CSRF Protection Bypass on setTheme, setHomePage, and eventIndexColumnToggle Endpoints
Attackers can forge requests to modify MISP user settings, such as the homepage URL, potentially enabling phishing attacks against authenticated users.
- 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-2026-90893?
CVE-2026-90893 is a medium-severity vulnerability in MISP, published on 14 Sep 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 a Cross-Site Request Forgery (CSRF) vulnerability in the UserSettingsController. The actions setTheme, setHomePage, and eventIndexColumnToggle were explicitly added to the Security component's unlockedActions list, which disabled all CSRF validation (both token and field-hash checks) for those endpoints. Because these endpoints accept POST requests and modify per-user application state (theme selection, default homepage URL, and event index column visibility), an attacker who can induce a logged-in MISP user to load a malicious page (e.g., via a crafted link, embedded image, or auto-submitting form) can forge requests that alter the victim's settings without their knowledge or consent. The most impactful action is setHomePage, which allows an attacker to redirect the victim's default landing page to an arbitrary attacker-controlled URL, potentially facilitating phishing or further social engineering. The setTheme action can alter the user's visual theme, and eventIndexColumnToggle can change which columns are displayed in the event index view. No authentication bypass is involved; the victim must already be authenticated to MISP. The vulnerability was reported by the Scottish Government National Cyber Team.
Version affected: ≤2.5.45
Weakness: CWE-352
Which versions are affected by CVE-2026-90893?
How do I fix CVE-2026-90893?
No fix has been published for CVE-2026-90893 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-90893 being exploited?
There is no known exploitation of CVE-2026-90893 in the wild and no public exploit code.
Sources
Also known as GHSA-g37r-568w-2pwm.