{"id":"CVE-2026-61456","summary":"Grav before 1.0.3 Stored XSS via SVG Upload API","details":"The Grav API plugin (getgrav/grav-plugin-api) before 1.0.3 fails to sanitize SVG files uploaded through the POST /api/v1/media endpoint. The HandlesMediaUploads::processUploadedFile() method validates only the file extension and never invokes Security::sanitizeSVG(), so an authenticated attacker with the api.media.write permission can upload an SVG containing arbitrary JavaScript. The file is stored unmodified and served with Content-Type: image/svg+xml; when an administrator opens it in a browser (directly or via \u003cobject\u003e/\u003ciframe\u003e), the embedded script executes in their session context, enabling cookie theft and session hijacking.","aliases":["GHSA-7vhm-8x52-2r5p"],"modified":"2026-07-15T01:48:59.479008481Z","published":"2026-07-10T13:58:09.670Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-79"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61456.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61456.json"},{"type":"ADVISORY","url":"https://github.com/getgrav/grav/security/advisories/GHSA-7vhm-8x52-2r5p"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-61456"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/grav-before-stored-xss-via-svg-upload-api"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/getgrav/grav","events":[{"introduced":"0"},{"fixed":"4a5a400b89f38244bf4c958242c557309527bedd"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"1.0.3"}],"source":["AFFECTED_FIELD","DESCRIPTION"]}}],"versions":["1.0.2","1.0.1","1.0.0","1.0.0-rc.6","1.0.0-rc.5","1.0.0-rc.4","1.0.0-rc.3","1.0.0-rc.2","1.0.0-rc.1","0.9.45","0.9.44","0.9.43","0.9.42","0.9.41","0.9.40","0.9.39","0.9.38","0.9.37","0.9.36","0.9.35","0.9.34","0.9.33","0.9.32","0.9.31","0.9.30","0.9.29","0.9.28","0.9.27","0.9.26","0.9.25","0.9.24","0.9.23","0.9.22","0.9.21","0.9.20","0.9.19","0.9.18","0.9.17","0.9.16","0.9.15","0.9.14","0.9.13","0.9.12","0.9.11","0.9.10","0.9.9","0.9.8","0.9.7","0.9.6","0.9.5","0.9.4","0.9.3","0.9.2","0.9.0","0.8.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-61456.json"}}],"schema_version":"1.7.5","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:N/SI:N/SA:N"}]}