Craft CMS up to 4.16.18/5.8.22 special elements used in a template engine

Summaryinfo

A vulnerability categorized as problematic has been discovered in Craft CMS up to 4.16.18/5.8.22. The impacted element is an unknown function. The manipulation results in improper neutralization of special elements used in a template engine. This vulnerability is reported as CVE-2026-28784. The attack can be launched remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Craft CMS up to 4.16.18/5.8.22. Affected is an unknown functionality. The manipulation with an unknown input leads to a improper neutralization of special elements used in a template engine vulnerability. CWE is classifying the issue as CWE-1336. The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Craft is a content management system (CMS). Prior to 5.8.22 and 4.16.18, 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. For this to work, you must have administrator access to the Craft Control Panel, and allowAdminChanges must be enabled for this to work, which is against our recommendations for any non-dev environment. Alternatively, you can have a non-administrator account with allowAdminChanges disabled, but you have access to the System Messages utility. Users should update to the patched versions (5.8.22 and 4.16.18) to mitigate the issue.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-28784 since 03/03/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Additional levels of successful authentication are required for exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1221 by the MITRE ATT&CK project.

Upgrading to version 4.17.0-beta.1 or 5.9.0-beta.1 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Content Management System

Vendor

• Craft

Name

• CMS

Version

• 4.16.0
• 4.16.1
• 4.16.2
• 4.16.3
• 4.16.4
• 4.16.5
• 4.16.6
• 4.16.7
• 4.16.8
• 4.16.9
• 4.16.10
• 4.16.11
• 4.16.12
• 4.16.13
• 4.16.14
• 4.16.15
• 4.16.16
• 4.16.17
• 4.16.18
• 5.8.0
• 5.8.1
• 5.8.2
• 5.8.3
• 5.8.4
• 5.8.5
• 5.8.6
• 5.8.7
• 5.8.8
• 5.8.9
• 5.8.10
• 5.8.11
• 5.8.12
• 5.8.13
• 5.8.14
• 5.8.15
• 5.8.16
• 5.8.17
• 5.8.18
• 5.8.19
• 5.8.20
• 5.8.21
• 5.8.22

License

• free

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Discussion