{"id":"CVE-2026-103321","published":"2026-09-30T13:17:18.463","lastModified":"2026-09-30T13:17:18.603","description":"MISP contains a stored cross-site script (XSS) vulnerability in the event graph preview feature.\n\nThe event graph preview image field was accepted and stored without server-side validation. On the client side, the stored value was rendered into an HTML img element's src attribute via string concatenation, allowing a crafted value to break out of the attribute context and inject arbitrary script.\n\nPreconditions:\n\n- An authenticated MISP user with the ability to create or modify an event graph entry.\n\n- A second user (the victim) who views the event graph and triggers the preview popover.\n\nImpact:\n\n- Execution of arbitrary JavaScript in the victim's browser within the MISP application context.\n\n- Potential theft of session tokens, cookies, or sensitive data accessible to the victim's browser.\n\n- Potential for performing actions on behalf of the victim within the MISP application.\n\nAffected: MISP versions prior to the fix (commit applied after v2.5.48).","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":["CWE-20","CWE-79"],"vendors":[],"products":[],"references":[{"url":"https://github.com/MISP/MISP/commit/92c7ccc43","tags":[]}],"exploitRefs":[{"url":"https://github.com/MISP/MISP/commit/92c7ccc43","tags":[]}],"hasPoc":true,"ai":null}