{"id":"CVE-2026-90957","summary":"MISP: Stored XSS via Inline-Served SVG Organisation Logos and Report Pictures","details":"Affected versions of MISP serve uploaded SVG images inline without a restrictive browser sandbox.\n\n\nThe commit explains that SVG files are XML documents rather than passive bitmap images. While scripts inside SVG do not execute when the SVG is rendered through a normal \u003cimg\u003e, they can execute when the SVG is navigated to directly or embedded as a document. In that case, malicious \u003cscript\u003e elements, event handlers, or javascript: URLs execute on the MISP origin with the viewer’s session.\n\n\nThe affected use cases include:\n\n\n\n - organisation SVG logos;\n - event-report SVG pictures.\n\n\n\n\n\n\nImportantly, the vulnerable behavior is on the serve path, not merely the upload path: the patch notes that a malicious SVG uploaded while SVG support was enabled could remain dangerous even after uploads were later disabled.\n\n\n\nVersion affected: ≤2.5.45","modified":"2026-09-18T03:30:25.512768676Z","published":"2026-09-14T13:03:01.748Z","database_specific":{"cna_assigner":"CIRCL","cwe_ids":["CWE-693","CWE-79"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90957.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90957.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90957"},{"type":"FIX","url":"https://github.com/MISP/MISP/commit/86496aecc"},{"type":"PACKAGE","url":"https://github.com/MISP/MISP"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/misp/misp","events":[{"introduced":"0"},{"fixed":"86496aecc"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"2.5.46"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90957.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N"}]}