GitHub Advisoryadvisory · Packagist

GHSA-qc86-q28f-ggww Craft CMS has potential authenticated Remote Code Execution via Twig SSTI

MEDIUM Published 2026-03-03 Modified 2026-03-04 Official page ↗
Aliases
CVE-2026-28784
Ecosystem
Packagist
Packages
craftcms/cms
Severity
Moderate
CVSS vector
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/E:U
Weaknesses
CWE-1336
Reviewed
2026-03-03

Affected packages

• Packagist craftcms/cms: >= 5.0.0-RC1, < 5.9.0-beta.1 → fixed in 5.9.0-beta.1 • Packagist craftcms/cms: >= 4.0.0-RC1, < 4.17.0-beta.1 → fixed in 4.17.0-beta.1

Description

For this to work, the attacker must have administrator access to the Craft Control Panel, and allowAdminChanges must be enabled, which is against Craft CMS' recommendations for any non-dev environment. https://craftcms.com/knowledge-base/securing-craft#set-allowAdminChanges-to-false-in-production Alternatively, they can have a non-administrator account with `allowAdminChanges` disabled, but they must have access to the System Messages utility. It is possible to craft a malicious payload using the Twig `map` filter in text fields that accept Twig input under Settings in the Craft control panel or using the System Messages utility, which could lead to a RCE. Users should update to the patched versions (5.8.22 and 4.16.18) to mitigate the issue. References: https://github.com/craftcms/cms/pull/18208

Related

Alias · CVE (1)

  • CVE-2026-28784 Craft is a content management system (CMS). vulnerability

Weakness · CWE (1)

  • CWE-1336 Improper Neutralization of Special Elements Used in a Template Engine weakness

References