Formie is a Craft CMS plugin for creating forms. Prior to 2.2.20 and 3.1.24, unauthenticated users could submit crafted values into Hidden fields (with Default value → Custom) that were evaluated as Twig during submission handling, which could lead to serious compromise of the Craft site (depending on template/sandbox behavior). This vulnerability is fixed in 2.2.20 and 3.1.24.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
References 4
https://github.com/verbb/formie/commit/f690d5623163ce2a95da305238d6367575486ee3
security-advisories@github.com
https://github.com/verbb/formie/releases/tag/2.2.20
security-advisories@github.com
https://github.com/verbb/formie/releases/tag/3.1.24
security-advisories@github.com
https://github.com/verbb/formie/security/advisories/GHSA-x7m9-mwc2-g6w2
security-advisories@github.com