Summary XSS can be triggered by review volumes

PoC

1. Access setting tab 2. Create new assets 3. In assets name inject payload: "<script>alert(1337)</script> 4. Click Utilities tab 5. Choose all volumes, or volume trigger xss 6. Click Update asset indexes. 7. Wait to assets update success. 8. Progress complete. 9. Click on review button will trigger XSS

Root cause Function: index.php?p=admin/actions/asset-indexes/process-indexing-session&v=1680710595770 After loading completed, progess will load: "skippedEntries" and "missingEntries" These parameters is not yet filtered, I just tried "skippedEntries" but I think it will be work with "missingEntries"

My reponse: { "session": { "id": 10, "indexedVolumes": { "6": "\"<script>alert(1337)</script>" }, "totalEntries": 2235, "processedEntries": 2235, "cacheRemoteImages": true, "listEmptyFolders": false, "isCli": false, "actionRequired": true, "dateCreated": "Apr 5, 2023, 9:03:16 AM", "skippedEntries": [ "\"<script>alert(1337)</script>/assetpreviews/Image.php", "\"<script>alert(1337)</script>/assetpreviews/Pdf.php" ], "missingEntries": { "folders": [], "files": [] }, "processIfRootEmpty": false }, "skipDialog": false }

Resolved in https://github.com/craftcms/cms/commit/053d7119697e480ff81c5723bb9a33eaa49e0fc7

Summary The platform does not filter input and encode output in Quick Post validation error message, which can deliver an XSS payload.

Details Old CVE fixed the XSS in label HTML but didn’t fix it when clicking save.

PoC 1. Login at admin 2. Go to setting 3. Create a Section 4. On Entry page, click Edit label 5. Inject the XSS payload into the label and save 6. On the admin dashboard choose new widget -> Quick Post 7. In Quick Post, click save with blank slug; The XSS will be executed

"errors":{"title":["<script>alert('nono')</script> cannot be blank."],"slug":["Slug cannot be blank."]

Fixed in https://github.com/craftcms/cms/commit/9d0cd0bda7c8a830a3373f8c0f06943e519ac888