CVE-2026-86730

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    CVE-2026-86730

    Published: 8 Sept 2026Last Modified: 10 Sept 2026

    Summary: Craft CMS 5.0.0-RC1 before 5.10.12 Behavior Injection RCE

    Details: Craft CMS versions before 5.10.12 fail to properly cleanse string-typed field-layout elements, allowing authenticated control-panel users to inject Yii2 behavior attachments and event handlers. Attackers can post field-layout tab elements as JSON strings to bypass cleanse validation, then trigger arbitrary object instantiation and code execution through Craft::createObject().

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86730.json, https://github.com/craftcms/cms/security/advisories/GHSA-qj4v-m29p-fj4m, https://nvd.nist.gov/vuln/detail/CVE-2026-86730, https://www.vulncheck.com/advisories/craft-cms-5.0.0-rc1-before-5.10.12-behavior-injection-rce

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 04755d93f86d07cc183db47db8a0eee106892e30
    Fixed -4edc686e69515ad42f5608580e351c765b664f80

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-86730 | CVE-DB