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Vulnerability record · CVE-2021-27903 · published 30 June 2021

CVE-2021-27903: Craftcms craft cms missing authorization vulnerability

Craftcms · Craft Cms

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).

9.8 CVSS 3.1 Critical EPSS 2.8% · top 14.0% CWE-862 · Missing authorization
9.8CVSS 3.1 base score, v2 7.5
2.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

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).

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/craftcms/cms/blob/develop/CHANGELOG.md#367---2021-02-23 Release NotesThird Party Advisory
https://github.com/craftcms/cms/blob/develop/CHANGELOG.md#security Release NotesThird Party Advisory
https://github.com/craftcms/cms/commit/c17728fa0bec11d3b82c34defe0930ed409aec38 PatchThird Party Advisory
https://github.com/craftcms/cms/blob/develop/CHANGELOG.md#367---2021-02-23 Release NotesThird Party Advisory
https://github.com/craftcms/cms/blob/develop/CHANGELOG.md#security Release NotesThird Party Advisory
https://github.com/craftcms/cms/commit/c17728fa0bec11d3b82c34defe0930ed409aec38 PatchThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-27903), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.