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Arbitrary class instantiation via user-supplied validation rules in the Control Panel

High
jasonvarga published GHSA-p5xm-f98m-55rw Oct 6, 2026

Package

composer statamic/cms (Composer)

Affected versions

<5.74.5, <6.35.1

Patched versions

5.74.5, 6.35.1

Description

Impact

A user with access to the Control Panel, but no other permissions, could cause arbitrary classes to be instantiated on the server by submitting crafted validation rules. Depending on the classes available in the application, this could be used to destroy files on the server or to make outbound network requests from it.

Exploitation requires an authenticated Control Panel session. It is not reachable by unauthenticated visitors or from the frontend.

Patches

This has been fixed in 5.74.5 and 6.35.1.

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H

CVE ID

No known CVE

Weaknesses

Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')

The product uses external input with reflection to select which classes or code to use, but it does not sufficiently prevent the input from selecting improper classes or code. Learn more on MITRE.

Credits