{"schema":"threatline.record/2","record":{"id":"CVE-2026-103321","aliases":[],"summary":"MISP Stored Cross-Site Scripting (XSS) via Unvalidated Event Graph Preview Image","details":"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).","categories":["Unclassified"],"product":"MISP","vendor":"MISP","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-103321","source_modified_at":"2026-09-30T12:44:22.064Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"MISP","vendor":"MISP","versions":[{"lessThan":"2.5.48","status":"affected","version":"0","versionType":"semver"}],"defaultStatus":null}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-103321","source_modified_at":"2026-09-30T12:44:22.064Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"MISP","ecosystem":null},"version":"2.5.48","basis":"first unaffected version stated in the CVE record"}],"cvss":8.3,"severity":"High","kev":{"listed":false},"epss":{"probability":0.0036,"percentile":0.28568,"score_date":"2026-10-23"},"published_at":"2026-09-30T12:19:01.829Z","modified_at":"2026-09-30T12:44:22.064Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-103321","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-09-30T12:44:22.064Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-103321","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/MISP/MISP/commit/92c7ccc43","tags":["patch"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"partial","assessed_at":"2026-09-30T12:44:13.205587Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-09-30T12:44:22.064Z","content_hash":"704c2c323825bdc61b70789b3ff29eadae22ac091fccbba4efda344c7c2fda49"}}