What’s Vulnerable › Vulnerabilities

CVE-2021-27902

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-06-30 · updated 2026-06-17
• Weakness: CWE-79

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.

Affected products

• craftcms cms: before 3.6.0 — fixed in 3.6.0

How to fix

Upgrade to a fixed version: craftcms cms 3.6.0. Check the vendor advisory for mitigations.

References

• https://github.com/craftcms/cms/blob/develop/CHANGELOG.md#360---2021-01-26
• https://github.com/craftcms/cms/blob/develop/CHANGELOG.md#security-1
• https://github.com/craftcms/cms/commit/8ee85a8f03c143fa2420e7d6f311d95cae3b19ce
• https://github.com/craftcms/cms/blob/develop/CHANGELOG.md#360---2021-01-26
• https://github.com/craftcms/cms/blob/develop/CHANGELOG.md#security-1
• https://github.com/craftcms/cms/commit/8ee85a8f03c143fa2420e7d6f311d95cae3b19ce

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