code16/sharp: Arbitrary class instantiation through the embed_key API parameter

published 2026-11-12 2d ago modified 2026-11-12 2d ago also GHSA-h24v-f482-8cwf

cvss: 5.4; version 3.1, GitHub
cisa kev: Not listed; not in CISA's catalog
epss: —; no EPSS score yet
public exploits: 0; none known

### Impact

An authenticated attacker can instantiate any class in the PHP application by using the `embed_key` parameter across multiple API endpoints. The instantiation is performed by the Laravel container. As a result, the `__construct()` method of the class is called and all constructor dependencies are resolved. The attacker cannot specify parameter values and cannot call any arbitrary method.

### Patches

The problem has been patched in 9.23.0 and pre-release version 10.0.0-beta.4. An additional check was added to verify that `embed_key` is a class extending `SharpFormEditorEmbed` before any instantiation.

### Workarounds

No known workarounds.

Patch / fix

fixed in 1 links 3

packagist code16/sharp 9.23.0, 10.0.0-beta.4

github.com/code16/sharp@dfafb44 commit
github.com/code16/sharp#750 pull request
github.com/code16/sharp/releases/tag/v9.23.0 release

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CVSS scores

assigned by	version	score	vector
GitHub	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

Affected packages

ecosystem	package	affected	fixed in
packagist	code16/sharp	<9.23.0 >=10.0.0-beta.1, <10.0.0-beta.4	9.23.0 10.0.0-beta.4

Classification

Weakness

CWE-470 Use of Externally-Controlled Input to Select Classes or Code

References

Sources

GitHub Advisory GHSA-h24v-f482-8cwf

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