CVE-2026-85237
HighCVSS 8.6Summary
A vulnerability in MISP's email-based one-time password (OTP) authentication flow allowed an attacker to perform an unrestricted number of OTP verification attempts. The email_otp() endpoint did not apply brute-force protection, enabling repeated guessing of OTP and potential bypass of the additional authentication factor.
Risk Assessment
An attacker who has obtained a user's primary credentials can more likely guess the OTP and gain unauthorized access to the account.
Recommendation
Update MISP to a version containing the fix that integrates brute-force protection into the OTP flow.
Other vulnerabilities in MISP
See all- CVE-2026-85239High
A vulnerability in MISP allows an authenticated user with permission to create or modify event templates to bypass validation of the template definition field. By supplying a pre-encoded string instead of an array structure, an invalid definition can be persistently stored. On retrieval, invalid JSON triggers an exception, causing HTTP 500 errors in event template functionality.
- CVE-2026-85238High
MISP contains a session fixation vulnerability in the CustomAuth authentication flow. After successful authentication via CustomAuth, MISP stores the authenticated user identity in the existing session without first rotating the session identifier. An attacker who knows the victim's session identifier before authentication can later reuse it to access the victim's authenticated session.
- CVE-2026-85236High
A cross-site request forgery (CSRF) vulnerability existed in the cullEmptyEvents action of MISP. The endpoint performed a state-changing and irreversible operation while accepting HTTP GET requests. An attacker could cause an authenticated user with sufficient privileges to invoke the endpoint, leading to deletion of published empty events.
- CVE-2026-85227Medium
MISP contains a reflected Cross-Site Scripting (XSS) vulnerability in the event attribute filtering query builder. The taggedAttributes and galaxyAttachedAttributes URL parameters were inserted into the query-builder rules without HTML escaping before being serialized as JSON and embedded inside a <script> element.
- CVE-2026-85226Medium
MISP contains an authorization flaw in the OnDemand correlation engine where correlations were calculated solely from matching attribute values without applying the distribution, sharing group, organization, or other access-control restrictions associated with the correlated attributes and events. As a result, an authenticated user could receive correlation results referring to attributes or events that the user was not authorized to access.
- CVE-2026-61474Medium
An improper authorization check in MISP's attribute creation endpoint allowed an authenticated user with permission to add attributes to submit a sharing_group_id without triggering the corresponding sharing group authorization check, as long as the attribute distribution value was not explicitly set to 4 — 'sharing group'.
- CVE-2017-14337High
In MISP versions before 2.4.80, when configured with X.509 certificate authentication alongside a non-MISP external user management API, an unauthenticated user can gain access as an arbitrary user if the API returns an empty value.
- CVE-2026-85216Critical
MISP contains an authentication bypass vulnerability in its LDAP and LinOTP authentication components due to insufficient validation of user-supplied credentials. An attacker knowing a valid directory user's email address could submit an empty password, which may be accepted by an LDAP server allowing unauthenticated binds. Additionally, in the LinOTP component, empty passwords could be checked against local MISP password hashes, and LDAP-provisioned accounts could be created with empty local passwords.
- CVE-2026-10868Critical
MISP has a mass assignment vulnerability in the user edit functionality (UsersController::edit()). An authenticated attacker can modify the user ID in the request, leading to updates on another user's account.
- CVE-2026-10611Critical
MISP contains an authentication bypass vulnerability when LDAP mixed authentication is enabled with OTP enforcement. An authenticated user can bypass the OTP step and access the application without providing a TOTP, HOTP, or email OTP code.
Original NVD description (English source)
A vulnerability in MISP's email-based one-time password (OTP) authentication flow allowed an attacker to perform an unrestricted number of OTP verification attempts. The email_otp() endpoint did not apply brute-force protection when validating submitted OTP values. An attacker who had reached the OTP verification stage, for example after successfully providing a user's primary authentication credentials, could repeatedly submit candidate OTP values while the same OTP remained valid. This significantly increased the feasibility of guessing the OTP and bypassing the additional authentication factor, potentially resulting in unauthorized access to the affected user's account. The issue was exacerbated by the fact that the OTP is associated with the user rather than with an individual pending login session, allowing multiple concurrent sessions to attempt guesses against the same valid OTP. The patch integrates the existing MISP brute-force protection mechanism into the email OTP flow. Failed OTP attempts are now counted against the user, further attempts are rejected once the configured threshold is reached, and the active OTP is invalidated when the attempt budget is exhausted. Blocklisted users are also prevented from requesting the generation of a fresh OTP. In addition, OTP comparison now uses hash_equals() and validates that the submitted value is a string.