Vulnerability · Published Aug 31, 2026 · Assigned by GitHub_M
CVE-2026-54179backpack/crud: SingleBase64Image accepts any base64 payload behind a `data:image` prefix — SVG-with-script lands on the public disk
Medium 4.4
In plain English
A medium-severity cross-site scripting in CRUD from Laravel-Backpack. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
backpack/crud provides Create, Read, Update & Delete (CRUD) functions for Backpack, a collection of Laravel packages that help users build custom administration panels. From 6.0.0 until 6.8.14 and 7.0.37, the src/app/Library/Uploaders/SingleBase64Image.php methods SingleBase64Image::uploadFiles and SingleBase64Image::uploadRepeatableFiles, used by image fields through withFiles(), accept any data URI beginning with data:image without validating the declared MIME subtype or decoded bytes, while src/app/Library/Uploaders/Support/FileNameGenerator.php method FileNameGenerator::getExtensionFromFile applies mime_content_type() to the data URI instead of the decoded content. An authenticated administrator can therefore store arbitrary file content under an extensionless filename on the configured disk, which can cause stored cross-site scripting or other unintended behavior when the file is served and accessed. This issue is fixed in version 7.0.38 and 6.8.14.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist | backpack/crud | 6.8.14 | GHSA-8hw4-7qjr-3wxg |
| Packagist | backpack/crud | 7.0.38 | GHSA-8hw4-7qjr-3wxg |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Laravel-Backpack | CRUD | >= 6.0.0, < 6.8.14>= 7.0.0, < 7.0.38 |
Weakness: CWE-79, CWE-434 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N
References
- https://github.com/Laravel-Backpack/CRUD/security/advisories/GHSA-8hw4-7qjr-3wxg x_refsource_CONFIRM
- https://github.com/Laravel-Backpack/CRUD/pull/5989 x_refsource_MISC
- https://github.com/Laravel-Backpack/CRUD/commit/18b3dc1c607775617f563c41bd1ddb983f11d751 x_refsource_MISC
- https://github.com/Laravel-Backpack/CRUD/releases/tag/6.8.14 x_refsource_MISC
- https://github.com/Laravel-Backpack/CRUD/releases/tag/7.0.38 x_refsource_MISC