CVE-2026-54177

MEDIUMPre-NVD 6.66.6
EchelonGraph scoreLOW confidence

This medium-severity CVE scores 6.6 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: cna:github_m
6.6EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 6.6Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Laravel Backpack CRUD: HasUploadFields keeps the attacker-supplied file extension — public-disk uploads of shell.php reach the webserver

Summary

HasUploadFields (used via CrudTrait on Backpack-managed models) and the withFiles() uploader preserve the client-supplied file extension without validation. On installations using a public disk with php artisan storage:link, this allows an authenticated administrator to upload a file with a server-executable extension that the web server will pass to the PHP interpreter - if no MIME or other type of upload validation is present.

Details

The uploadFileToDisk and uploadMultipleFilesToDisk methods hash the filename stem but write the client-supplied extension to disk verbatim — no allowlist, blocklist, or MIME check is applied inside the trait itself.

The newer withFiles() path (via FileNameGenerator) resolves the extension from the file's MIME type rather than the client filename, but also does not block server-executable types.

Applications that follow the Backpack quickstart without adding explicit mimes: or mimetypes: validation rules in their form requests are affected.

Impact

An authenticated administrator with access to an upload-enabled CRUD panel, on a site using the public disk with web-accessible storage and no MIME type validation, can upload a server-executable file and achieve remote code execution.

Conditions required for exploitation:

  • Authenticated admin access to a Backpack CRUD panel
  • An upload field with no mimes: / mimetypes: validation rule
  • The public disk in use (standard pattern for web-visible uploads)
  • php artisan storage:link in place
  • A web server + PHP-FPM stack (default on most hosts)

Fix

A denylist for server-executable extensions has been added to both HasUploadFields and FileNameGenerator. Image-typed fields now additionally enforce an allowlist. This is defence-in-depth — it does not replace application-level validation.

Recommended developer action

Review all upload fields and add explicit mimes: or mimetypes: validation in your form requests or field definitions. Refer to the Backpack field documentation for examples.

Reported by Vishal Shukla (@shukla304) via sechub.dev.

CVSS v3
6.6
EG Score
6.6(low)
EG Risk
34(Track)
EG Risk 34/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity66% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
—
EPSS %ILE
—
KEV
Not listed

Published

August 20, 2026

Last Modified

August 20, 2026

Vendor Advisories for CVE-2026-54177(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Data Freshness Timeline

(refreshed 1× in last 7d / 1× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-20 18:42 UTCEG score recompute

Frequently asked(4)

What is CVE-2026-54177?
CVE-2026-54177 is a medium vulnerability published on August 20, 2026. Laravel Backpack CRUD: HasUploadFields keeps the attacker-supplied file extension — public-disk uploads of shell.php reach the webserver Summary HasUploadFields (used via CrudTrait on Backpack-managed models) and the withFiles() uploader preserve the client-supplied file extension without…
When was CVE-2026-54177 disclosed?
CVE-2026-54177 was first published in the National Vulnerability Database on August 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-54177?
CVE-2026-54177 has a CVSS v4.0 base score of 6.6 (CNA self-assessment; NVD's own analysis pending). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-54177?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54177, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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