Medium severity · published Jun 30, 2021
CVE-2021-27902
An issue was discovered in Craft CMS before 3.6.0
6.1
CVSS
1%
EPSS
No
On KEV
Description
An issue was discovered in Craft CMS before 3.6.0. In some circumstances, a potential XSS vulnerability existed in connection with front-end forms that accepted user uploads.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 62% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CC
Craft Cms · Craftcms
before 3.6.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-27902
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-27902
Release Notes
https://github.com/craftcms/cms/blob/develop/CHANGELOG.md#360---2021-01-26
Release Notes
https://github.com/craftcms/cms/blob/develop/CHANGELOG.md#security-1
Patch
https://github.com/craftcms/cms/commit/8ee85a8f03c143fa2420e7d6f311d95cae3b19ce
More from Craft Cms
10.0
CVE-2025-32432
Craft CMS Allows Remote Code Execution
9.8
CVE-2024-56145
RCE when PHP `register_argc_argv` config setting is enabled in craftcms/cms
8.1
CVE-2025-23209
Potential RCE with a compromised security key in craft/cms
5.3
CVE-2025-35939
Craft CMS stores user-provided content in session files
9.8
CVE-2026-32267
Craft CMS Vulnerable to Privilege Escalation/Bypass through UsersController->actionImpersonateWithToken()