{"items":[{"id":"NVI-00004880","kind":"vulnerability","title":"livewire-markdown-editor has arbitrary file upload that allows stored XSS via attachment handler","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-gxxh-8vcj-w2mh"],"plain_summary":"OSV carries this publisher advisory for mckenziearts/livewire-markdown-editor. This is an aggregated source copy; consult the original publisher and compare update dates.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"The original advisory lists fixed boundaries 1.3 for mckenziearts/livewire-markdown-editor. Confirm the publisher’s latest guidance.","source_ids":["sr-774b7c1224687346b1aacbf54aab9df9"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-774b7c1224687346b1aacbf54aab9df9","url":"https://github.com/advisories/GHSA-gxxh-8vcj-w2mh","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-gxxh-8vcj-w2mh","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:20.423Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-774b7c1224687346b1aacbf54aab9df9"],"technology":"mckenziearts/livewire-markdown-editor","known_exclusions":[],"conditions_summary":"### Impact\nAll versions of `mckenziearts/livewire-markdown-editor` prior to **v1.3** contain a critical arbitrary file upload vulnerability in the `MarkdownEditor::updatedAttachments()` Livewire handler. The handler calls `$file->store()` with no server-side validation of MIME type, extension, or file content.\n\nAny authenticated user with access to a page embedding `` can upload files of any type (`.html`, `.svg`, `.js`, `.php`, `.exe`, etc.) to the disk configured by `livewire-markdown-editor.disk`. When that disk is a public cloud bucket (S3, DigitalOcean Spaces, Cloudflare R2, Scaleway Object Storage — the common configuration when `FILESYSTEM_DISK` points to such a disk), uploaded files are served publicly with a guessed `Content-Type` header.\n\nThe consequences include:\n\n- **Stored XSS** on the storage domain via uploaded `.html` or `.svg` files\n- **Phishing page hosting** on the application's own storage domain (trust laundering)\n- **Malware distribution** from a domain users associate with the application\n- **Markdown injection** in the editor output via crafted filenames (the client-supplied `getClientOriginalName()` value was inserted verbatim into","public_affected_ranges":["ECOSYSTEM: introduced 0; fixed 1.3"]}],"null_published_at":"2026-10-31T22:12:57.146Z","source_updated_at":"2026-05-05T16:13:01.980Z","source_disclosed_at":"2026-05-04T22:11:05.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-10-31T21:42:20.423Z"}],"next_cursor":null,"snapshot_revision":"42594"}