CVE-2026-85547
MediumCVSS 6.2Exploitation Probability (EPSS)
Low risk27th percentile - higher than 27% of all known CVEs
Summary
A CSRF vulnerability exists in MISP due to form-security and CSRF protections being disabled based on REST request detection, which can be influenced by request properties like the Accept header. An attacker can craft cross-origin requests that are treated as REST traffic, bypassing CSRF protection for session-authenticated requests. The fix restricts exemptions to requests carrying a MISP API key and adds support for X-CSRF-Token header.
Risk Assessment
An attacker can trick an authenticated MISP user into visiting a malicious page, enabling unauthorized state-changing operations (modification, creation, publication, deletion) with the victim's privileges. This could compromise data integrity and confidentiality within the organization.
Recommendation
Update MISP to a patched version immediately, where CSRF exemptions are granted only for API-key-authenticated requests. Also ensure support for the X-CSRF-Token header for legitimate same-origin AJAX requests.
Other vulnerabilities in MISP
See all- CVE-2026-107180High
On MISP instances configured to require TOTP enrolment (Security.otp_required), the enforcement of mandatory two-factor authentication applied only to standard browser requests. An authenticated user who had not yet enrolled in TOTP could bypass the forced setup by issuing non-browser requests (AJAX/XHR, REST API, .json URLs, restSearch, automation). Because these requests cannot follow the redirect to the TOTP enrolment page, the guard was skipped, and the user retained full access without completing the second-factor setup. Fixes (commits 8deb0619e and 6b527ba6e) broadened the guard to cover all non-browser requests, except API key authentication. Affected version: <2.5.48.
- CVE-2026-107175Medium
MISP contains a defect in its event save workflow that prevents the correlation engine from recalculating correlations when an event's distribution level or sharing group is modified. When a user edits an existing event and changes its distribution or sharing_group_id, the internal before-save hook stored the incoming (new) data rather than the previously persisted values. As a result, the after-save comparison that determines whether a correlation refresh is needed never detected the change, and stale correlations persisted. Security impact: stale correlations may continue to expose event data to users in a broader sharing group after the event has been moved to a more restrictive group, resulting in unintended information disclosure. Conversely, newly relevant correlations may not appear after a distribution widening, degrading the completeness of threat intelligence sharing. Preconditions: an authenticated user with write access to at least one MISP event; the user modifies the event's distribution or sharing_group_id field. Affected versions: <2.5.48
- CVE-2026-104908High
MISP before version 2.5.48 has an improper input validation vulnerability in the decaying model import functionality. A user with perm_decaying permissions can overwrite existing models of other organizations, change their ownership, or create a default model, affecting scoring behavior.
- CVE-2026-104907Medium
MISP contains a cross-site scripting (XSS) vulnerability in the remote event preview page. When a linked (remote) MISP server is configured, the event preview renders tag identifiers inside an inline JavaScript onclick attribute. The tag ID value was HTML-escaped but not sanitized for the JavaScript string context, meaning a malicious linked server could supply a tag ID containing characters (such as a single quote) that break out of the JavaScript string literal and inject arbitrary script. Preconditions: a linked/remote MISP server is configured and connected to the local instance, the linked server supplies a crafted tag ID in an event, and an authenticated user views the event preview and interacts with the affected tag element. Impact: arbitrary JavaScript execution in the context of the viewing user's browser session, potentially allowing session hijacking, data exfiltration, or unauthorized actions on behalf of the user. Affected versions: MISP prior to the fix commit (v2.5.48 or later, exact boundary unconfirmed).
- CVE-2026-104906Medium
MISP contains a cross-site scripting (XSS) vulnerability in the TAXII object viewer. When displaying a remote TAXII object, the JSON content of string properties was rendered directly into an HTML pre block without HTML-encoding. An attacker who can control or influence the content of a TAXII object can inject arbitrary HTML or JavaScript that executes in the context of the victim's MISP session. Preconditions: the victim must be an authenticated MISP user with access to the TAXII object viewer, and the victim must open or view the crafted TAXII object. Impact: execution of arbitrary JavaScript in the victim's browser within the MISP application context, potential theft of session tokens, API keys, or other sensitive data, and potential for performing actions on behalf of the authenticated user. Affected versions: <2.5.48.
- CVE-2026-104901Medium
MISP contains a cross-site scripting (XSS) vulnerability in the ID Translator feature. When a user views the ID Translator page, the application queries linked (remote) MISP servers for corresponding event identifiers. The event ID returned by the remote server was rendered in the HTML output without proper output encoding. A malicious or compromised linked server could return a crafted event ID containing arbitrary HTML or JavaScript markup. This markup would be rendered in the browser of any user in the host organization who views the ID Translator page, enabling session hijacking, credential theft, or other client-side attacks. Preconditions: the victim must be an authenticated user of the host MISP instance, a linked server must be configured on the host instance, and the victim must navigate to the ID Translator page for a given event. Affected versions: <2.5.48.
- CVE-2026-104900Medium
MISP contains a stored cross-site scripting (XSS) vulnerability in the index table rendering of the remote event preview. The count field template escaped the associated link URL but rendered the field value without HTML encoding. An attacker with the ability to create or modify events on a linked (remote) MISP server could craft an event identifier containing HTML or JavaScript markup. When a user on the local MISP instance views the remote event preview index, the unescaped value is rendered directly in the browser, allowing arbitrary script execution in the victim's session. Preconditions: a linked/remote MISP server is configured and connected to the local instance, the attacker has sufficient access on the linked server to create or modify an event with a crafted identifier, and a victim user on the local instance views the remote event preview index page. Impact: execution of arbitrary JavaScript in the context of the MISP web application, potential session hijacking, data exfiltration, or unauthorized actions performed on behalf of the authenticated user. Affected versions: <2.5.48.
- CVE-2026-103858Medium
MISP before version 2.5.48 contains an incomplete authorization check in the discussion posting functionality. An authenticated user outside the sharing group or without visibility on the associated event can read the thread title and quoted post content, and submit new posts into the thread, to which they are not authorized.
- CVE-2026-103664Medium
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).
- CVE-2026-103662Medium
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.
Original NVD description (English source)
A cross-site request forgery (CSRF) vulnerability exists in MISP due to form-security and CSRF protections being disabled based on whether an incoming request was identified as a REST request. MISP's REST detection can be influenced by request properties such as the URL suffix or the HTTP Accept header. Because Accept: application/json can be supplied by a cross-origin page without requiring a CORS preflight, an attacker could cause a request originating from another website to be treated as REST traffic. MISP would consequently disable its normal form-security and CSRF validation even though the request was authenticated using the victim's existing browser session. An unauthenticated remote attacker could exploit this behavior by convincing an authenticated MISP user to visit or interact with a malicious web page. The attacker's page could then issue crafted requests to susceptible state-changing MISP endpoints using the victim's privileges. Depending on the permissions of the victim and the targeted endpoint, this could allow unauthorized modification, creation, publication, or removal of data and other state changes. The vulnerability originates from granting the form-security exemption based on _isRest() rather than on the authentication mechanism used by the request. The patch changes this behavior so that CSRF and form-security exemptions are granted only when the request actually carries a MISP API key. Session-authenticated REST-style requests remain subject to CSRF protection. The fix also introduces support for transmitting CSRF tokens through the X-CSRF-Token header for legitimate same-origin AJAX requests. Such a header cannot normally be attached by a cross-origin page without triggering a CORS preflight, preventing it from being used to reproduce the original attack.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS