What’s Vulnerable › Vulnerabilities

CVE-2021-27903

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.8% 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-862

Description

An issue was discovered in Craft CMS before 3.6.7. In some circumstances, a potential Remote Code Execution vulnerability existed on sites that did not restrict administrative changes (if an attacker were somehow able to hijack an administrator's session).

Affected products

• craftcms cms: before 3.6.7 — fixed in 3.6.7

How to fix

Upgrade to a fixed version: craftcms cms 3.6.7. Check the vendor advisory for mitigations.

References

• https://github.com/craftcms/cms/blob/develop/CHANGELOG.md#367---2021-02-23
• https://github.com/craftcms/cms/blob/develop/CHANGELOG.md#security
• https://github.com/craftcms/cms/commit/c17728fa0bec11d3b82c34defe0930ed409aec38
• https://github.com/craftcms/cms/blob/develop/CHANGELOG.md#367---2021-02-23
• https://github.com/craftcms/cms/blob/develop/CHANGELOG.md#security
• https://github.com/craftcms/cms/commit/c17728fa0bec11d3b82c34defe0930ed409aec38

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