{"id":"CVE-2026-103321","title":"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","summary":"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 render…","severity":"high","cvss":8.3,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:H/VA:N/SC:H/SI:H/SA:N","cwe":["CWE-20","CWE-79"],"vendor":"MISP","product":"MISP","affected":["MISP < 2.5.48"],"published":"2026-09-30","updated":"2026-09-30","sourceUpdated":"2026-09-30T13:17:18.603","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-103321","references":[{"url":"https://github.com/MISP/MISP/commit/92c7ccc43","label":"5a6e4751-2f3f-4070-9419-94fb35b644e8"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-30T12:44:13.205587Z"},"cvssSource":"cna","ingestedAt":"2026-09-30T13:03:51.967Z","slug":"CVE-2026-103321","body":"## Overview\n\nMISP 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).\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":45.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}