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CVE-2026-41247 — studio-42/elfinder

CVE-2026-41247 is a OS Command Injection vulnerability in studio-42/elfinder. A fix is available for studio-42/elfinder — see the affected versions and patch details below.

elFinder: Command injection in resize background color parameter when using ImageMagick CLI

Also known asGHSA-8q4h-8crm-5cvc
Published
Apr 23, 2026
Updated
Aug 12, 2026
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Sep 22, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • A successful exploit gives an attacker total control of the affected component, not partial access.
  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-41247.

EPSS Exploitation Probability

via FIRST.org ↗
1.6%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs74th percentile — riskier than 74% of all scored CVEsHighest risk

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Real-World Exposure

1 pkg affected
🐘studio-42/elfinder

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Severity

High
bg can be injected into shell command construction, leading to possible RCE in affected configurations.

Summary

elFinder contains a command injection vulnerability in the resize command.

The bg (background color) parameter is accepted from user input and passed through image resize/rotate processing. In configurations that use the ImageMagick CLI backend, this value is incorporated into shell command strings without sufficient escaping. An attacker able to invoke the resize command with a crafted bg value may achieve arbitrary command execution as the web server process user.

This issue affects configurations where:

  • the resize command is enabled,
  • image processing uses the ImageMagick CLI backend, and
  • the vulnerable code paths are reachable.

Impact

An attacker may execute arbitrary OS commands with the privileges of the web server process.

Impact depends on server configuration, enabled commands, backend image library selection, and surrounding deployment controls.

Affected versions

Affected: all versions before 2.1.66 Patched: 2.1.67

Details

The vulnerable flow is:

  1. The resize command accepts the bg parameter from the request.
  2. The parameter is passed into volume resize handling.
  3. In ImageMagick CLI code paths, the value is interpolated into shell command strings.
  4. Because the value is not safely constrained and escaped, shell metacharacters may be injected.

The issue was addressed by:

  • validating bg against a strict allowlist of supported color formats, and
  • safely escaping the value before it is passed into CLI command construction.

Workarounds

Possible mitigations for users who cannot upgrade immediately:

  • disable the resize command if not required,
  • avoid using the ImageMagick CLI backend for image processing,
  • restrict access to trusted users only.

Upgrading to the patched release is strongly recommended.

Credits

Thanks to Lin, WeiChi and Drew Webber for the responsible disclosure.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagiststudio-42/elfinderall versions2.1.67composer require studio-42/elfinder:^2.1.67

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for studio-42/elfinder, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update studio-42/elfinder to 2.1.67 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-41247 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

  4. How O3 protects you

    O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2026-41247 can be triaged on real exposure rather than presence alone.

Tailored to CVE-2026-41247. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

### Severity **High** `bg` can be injected into shell command construction, leading to possible RCE in affected configurations. ### Summary elFinder contains a command injection vulnerability in the `resize` command. The `bg` (background color) parameter is accepted from user input and passed through image resize/rotate processing. In configurations that use the ImageMagick CLI backend, this value is incorporated into shell command strings without sufficient escaping. An attacker able to invoke the `resize` command with a crafted `bg` value may achieve arbitrary command execution as the w
O3 Security · Impact-Aware SCA

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CVE-2026-41247: studio-42/elfinder RCE | O3 Security