# CVE-2026-84974: Code16 Sharp arbitrary class instantiation in embed_key parameter

Source: https://junglewise.ai/threats/cve-2026-84974-code16-sharp-arbitrary-class-instantiation-through-the-embed-key  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-12. Updated: 2026-11-12  
License: CC BY 4.0 with a link back

CVE-2026-84974 · Severity: medium · CVSS 5.4 · Published 2026-11-12

Code16 Sharp is a PHP library for building data management interfaces in Laravel applications. An authenticated attacker can instantiate arbitrary classes by manipulating the embed_key API parameter, triggering unintended constructor execution that may cause application malfunction or expose sensitive information through dependency injection side effects.

Technologies: [Code16 Sharp](https://junglewise.ai/threats/technologies/sharp), [code16/sharp (Packagist)](https://junglewise.ai/threats/technologies/code16-sharp). Vendors: [Code16](https://junglewise.ai/threats/vendors/code16), [Packagist](https://junglewise.ai/threats/vendors/packagist).

## Quick answers

**Is CVE-2026-84974 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-84974 being exploited in the wild.

**How severe is CVE-2026-84974?** Medium severity, with a CVSS score of 5.4, published 12 November 2026.

**Which products and versions are affected?** Code16 Sharp < 9.23.0, >= 10.0.0-beta.1 and < 10.0.0-beta.4; code16/sharp (Packagist) < 9.23.0.

**Is there a fix for CVE-2026-84974?** Yes: fixed in 9.23.0, 10.0.0-beta.4. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-84974 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-84974?** Check whether you run Code16 Sharp or code16/sharp (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 9.23.0, 10.0.0-beta.4

## Technical details

The vulnerability exists in Sharp's API endpoints that process the embed_key parameter without validating it is an instance of SharpFormEditorEmbed before passing it to Laravel's container for class instantiation. An authenticated attacker exploits this via CWE-470 (externally-controlled input selecting classes) to invoke the __construct() method of arbitrary classes with their resolved dependencies. The attacker cannot control parameter values or call additional methods, limiting impact to constructor side effects.

## Affected products

- Code16 Sharp < 9.23.0, >= 10.0.0-beta.1 and < 10.0.0-beta.4

## Identifiers

- CVE-2026-84974
- GHSA-h24v-f482-8cwf

## Timeline

- 2026-07-17: disclosed
- 2026-11-12: advisory

## References

- [https://api.github.com/users/The4v1](https://api.github.com/users/The4v1)

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