{"id":"CVE-2023-41318","aliases":["GHSA-5crw-6j7v-xc72","GO-2023-2053"],"url":"https://o3.security/vulnerability/CVE-2023-41318","summary":"Unsafe media served inline on download endpoints in matrix-media-repo","details":"### Impact\nA malicious user can upload an SVG image containing JavaScript to their server. When matrix-media-repo is asked to serve that media via the `/_matrix/media/(r0|v3)/download` endpoint, it would be served with a `Content-Disposition` of `inline`. This can allow JavaScript to run in the browser if a client links to the `/download` endpoint directly.\n\nServer operators which do not share a domain between matrix-media-repo and other services are not affected, but are encouraged to upgrade regardless.\n\n### Patches\nhttps://github.com/turt2live/matrix-media-repo/commit/77ec2354e8f46d5ef149d1dcaf25f51c04149137 and https://github.com/turt2live/matrix-media-repo/commit/bf8abdd7a5371118e280c65a8e0ec2b2e9bdaf59 fix the issue. Operators should upgrade to v1.3.0 as soon as possible.\n\n### Workarounds\nThe `Content-Disposition` header can be overridden by the reverse proxy in front of matrix-media-repo to always use `attachment`, defeating this issue at the cost of \"worse\" user experience when clicking download links.\n\n### References\nhttps://developer.mozilla.org/en-US/docs/Web/SVG/Element/script\n\n","published":"2023-09-08T19:51:20.011Z","modified":"2026-10-28T02:30:54.838690375Z","cvss":{"score":4.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/turt2live/matrix-media-repo","fixedVersion":"1.3.0"}],"fix":{"url":"https://github.com/turt2live/matrix-media-repo/commit/77ec2354e8f46d5ef149d1dcaf25f51c04149137","label":"turt2live/matrix-media-repo@77ec235"},"references":[{"type":"WEB","url":"https://developer.mozilla.org/en-US/docs/Web/SVG/Element/script"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/41xxx/CVE-2023-41318.json"},{"type":"ADVISORY","url":"https://github.com/turt2live/matrix-media-repo/security/advisories/GHSA-5crw-6j7v-xc72"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-41318"},{"type":"FIX","url":"https://github.com/turt2live/matrix-media-repo/commit/77ec2354e8f46d5ef149d1dcaf25f51c04149137"},{"type":"FIX","url":"https://github.com/turt2live/matrix-media-repo/commit/bf8abdd7a5371118e280c65a8e0ec2b2e9bdaf59"},{"type":"PACKAGE","url":"https://github.com/turt2live/matrix-media-repo"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:30:54.838690375Z"}}