CVE-2026-103389

MISP contains a reflected XSS vulnerability in the analyst data notes panel. The seed path parameter supplied via URL is passed directly into inline JavaScript without sanitization. An attacker can trick an authenticated user into visiting a crafted URL, allowing arbitrary JavaScript execution in the victim's browser. Affects versions prior to the fix (commit 58925dbf0, post v2.5.48).

MISP contains a reflected XSS vulnerability in legacy taxonomy tag confirmation forms (add and disable tag). The forms echoed user-supplied tag names without escaping. An attacker can trick an administrator into visiting a crafted URL with a malicious tag, allowing arbitrary JavaScript execution in the admin's session. Affects versions <2.5.48.

MISP contains a vulnerability in its one-time password (OTP) authentication flow that allows replay of a consumed HOTP (paper) token and rewinding of the token counter. The HOTP verification logic compared the submitted token against a counter value cached in the user's session at the time the password was entered, rather than against the authoritative counter stored in the database. Because the session-cached counter is not updated after a token is successfully consumed, an attacker who holds a valid session (password already submitted) can reuse a previously burned HOTP token. Preconditions: the target user has HOTP (paper token) second-factor authentication enabled; the attacker possesses a valid session in which the password step has already been completed (the OTP step is pending); the attacker has access to at least one HOTP token value (e.g., a paper token list). Security impact: bypass of the second authentication factor, allowing unauthorized access to a user's MISP account; corruption of the HOTP counter state, potentially invalidating subsequent legitimate tokens or enabling further replays. Affected versions: <2.5.48.

MISP renders the source field of a Galaxy Cluster as a clickable hyperlink when the value passes FILTER_VALIDATE_URL, which accepts javascript: URIs. A user with galaxy editor privileges can store a javascript: URL, and when another user clicks it, the script executes in their browser.

MISP contains a stored cross-site scripting (XSS) vulnerability in the event graph preview feature. The event graph preview image field is accepted and stored without server-side validation, allowing a crafted value to break out of the attribute context and inject arbitrary script.

MISP contains a privilege escalation vulnerability in the tag collection creation and editing functionality. The affected actions accepted the full HTTP request payload and passed it to a bulk-association save operation, which writes not only the intended tag collection record but also any associated model data present in the payload. A user with tag editor permission could craft a request that includes additional model data (such as User or Organisation records), enabling modification or creation of privileged accounts and escalation to site administrator.

MISP contains an improper input validation vulnerability in its ORM save path. When a user submits data through various endpoints, the application sanitizes the flat record by stripping the primary key and pinning the event_id or object_id to the caller's context. However, the underlying ORM's set() method gives priority to a nested key whose name matches the model alias and discards the outer scalar fields. An authenticated user with basic write permissions can exploit this to overwrite, re-parent, or soft-delete rows belonging to other organizations or events they have no read access to.

MISP contains a mass assignment vulnerability in the event delegation feature. When a user with delegation permission submits a delegation request, the application authorized the user against the event identified in the URL but then persisted the entire submitted record, including caller-supplied fields such as the primary key and event_id. An authenticated attacker could inject a primary key or event_id into the delegation payload to retarget an existing delegation record to any event on the instance, leading to unauthorized read access to events of other organizations, and if the delegation is accepted, transfer of event ownership.

MISP registers PHP's phar stream wrapper in both its web and console entry points. This causes filesystem operations on caller-influenced paths to trigger implicit unserialize() (a deserialization sink), and a relocated application root can reach executable code inside an uploaded phar file, enabling code execution as the web user.

A typo in the MISP ACLComponent access control configuration caused the ACL rule for the previewEventAttributes action to reference the permission string 'theming_enabled*' (with a trailing asterisk) instead of the correct 'theming_enabled'. The malformed key does not match any valid permission identifier, causing the access control check for previewEventAttributes to malfunction — potentially resulting in either an authorization bypass or denial of access for legitimate users.