GHSA-4484-8v2f-5748 — high GitHub Advisory (CVE-2026-32264) in composer/craftcms/cms

Description

The fix for https://github.com/advisories/GHSA-7jx7-3846-m7w7 (commit https://github.com/craftcms/cms/commit/395c64f0b80b507be1c862a2ec942eaacb353748) only patched src/services/Fields.php, but the same vulnerable pattern exists in ElementIndexesController and FieldsController.

You need Craft control panel administrator permissions, and allowAdminChanges must be enabled for this to work.

An attacker can use the same gadget chain from the original advisory to achieve RCE.

Users should update to Craft 4.17.5 and 5.9.11 to mitigate the issue.

Basic information

Type: reviewed
Severity: high
Advisory on GitHub: Open advisory ↗
Repository advisory: Open repository advisory ↗
Source code: Browse source ↗
Published (advisory): 2026-03-16 18:13:15 UTC
Updated: 2026-03-16 21:57:51 UTC
GitHub reviewed: 2026-03-16 18:13:15 UTC
NVD published: 2026-03-16

Score	Percentile
0.05%	13.98%

CVSS Scores

Base score	Version	Severity	Vector
8.6	4.0	—	`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network. Attack complexity (AC:L) Exploitation conditions are straightforward and stable. Attack requirements (AT:N) No additional preconditions are required beyond normal reachability. Privileges required (PR:H) High privileges are required. User interaction (UI:N) No user interaction is required. Vulnerable system confidentiality impact (VC:H) High confidentiality impact on the vulnerable system. Vulnerable system integrity impact (VI:H) High integrity impact on the vulnerable system. Vulnerable system availability impact (VA:H) High availability impact on the vulnerable system. Subsequent system confidentiality impact (SC:N) No confidentiality impact on subsequent systems. Subsequent system integrity impact (SI:N) No integrity impact on subsequent systems. Subsequent system availability impact (SA:N) No availability impact on subsequent systems.

Identifiers

Type	Value
GHSA	GHSA-4484-8v2f-5748 ↗
CVE	CVE-2026-32264 ↗

CWEs

CWE id	Name
CWE-470	Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')

Affected packages (2)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem	Package	Vulnerable range	First patched	Vulnerable functions
composer	craftcms/cms	>= 4.0.0-RC1, <= 4.17.4	4.17.5	—
composer	craftcms/cms	>= 5.0.0-RC1, <= 5.9.10	5.9.11	—

Craft CMS vulnerable to behavior injection RCE ElementIndexesController and FieldsController