SB2026050445 - Multiple vulnerabilities in Craft CMS

Description

This security bulletin contains information about 2 vulnerabilities.

1) Stored cross-site scripting (CVE-ID: N/A)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data within User Group Name in User Permissions Page. A remote user can inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

2) Improper Neutralization of Special Elements Used in a Template Engine (CVE-ID: CVE-2026-28784)

CWE-ID: CWE-1336 - Improper Neutralization of Special Elements Used in a Template Engine

CVSSv4: 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/U:Clear

The vulnerability allows a remote user to compromise the target system.

The vulnerability exists due to server-side template injection (SSTI) issue in Twig "map" filter. A remote administrator can execute arbitrary code on the system.

Remediation

Install update from vendor's website.

References

• https://github.com/craftcms/cms/security/advisories/GHSA-g3hp-vvqf-8vw6
• https://github.com/craftcms/cms/security/advisories/GHSA-qc86-q28f-ggww