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CVE-2026-86732

Craft CMS before 5.10.12 Remote Code Execution via element-index

CVSS 4.0 8.7 HIGHCVSS 3.1 8.8 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-86732

Published

Craft CMS versions before 5.10.12 contain a remote code execution vulnerability in the element-index endpoint that allows authenticated content editors to instantiate arbitrary classes through the criteria parameter. Attackers can inject a malicious class via criteria[withTransforms][0][class] that reaches ImageTransforms::normalizeTransform(), then use a PHP gadget chain with yii\rbac\PhpManager to execute code by pointing itemFile to a request log containing PHP payload in the User-Agent header.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-86732

Published

cms

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "craftcms",
                    "product": "cms",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "version": "5.0.0-RC1",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThan": "5.10.12"
                        },
                        {
                            "version": "5.10.12",
                            "status": "unaffected",
                            "versionType": "semver"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON