backpack/crud: SingleBase64Image accepts any base64 payload behind a `data:image` prefix — SVG-with-script lands on the public disk

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-54179
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-31 21:17:09 UTC
Updated2026-09-08 21:11:31 UTC
Descriptionbackpack/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.

Risk And Classification

Primary CVSS: v3.1 4.4 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS: 0.002030000 probability, percentile 0.102570000 (date 2026-09-08)

Problem Types: CWE-79 | CWE-434 | CWE-79 CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | CWE-434 CWE-434: Unrestricted Upload of File with Dangerous Type

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.4MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N
3.1CNADECLARED4.4MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Laravel-Backpack CRUD affected >= 6.0.0, < 6.8.14 Not specified
CNA Laravel-Backpack CRUD affected >= 7.0.0, < 7.0.38 Not specified

References

ReferenceSourceLinkTags
github.com/Laravel-Backpack/CRUD/pull/5989 [email protected] github.com
github.com/Laravel-Backpack/CRUD/releases/tag/7.0.38 [email protected] github.com
github.com/Laravel-Backpack/CRUD/commit/18b3dc1c607775617f563c41bd1ddb98... [email protected] github.com
github.com/Laravel-Backpack/CRUD/security/advisories/GHSA-8hw4-7qjr-3wxg [email protected] github.com
github.com/Laravel-Backpack/CRUD/releases/tag/6.8.14 [email protected] github.com
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