CVE-2026-86730CWE-94code-injection

CVE-2026-86730

High · published September 8, 2026

CVSS v3.1
8.8
EPSS
1%
Percentile
52.9
In the wild
Unconfirmed
What it is

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().

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.00707 · 52.9th percentile
Weakness
CWE-94 · Improper Control of Generation of Code ('Code Injection')
Published
2026-09-08T20:18Z
References (2)
https://github.com/craftcms/cms/security/advisories/GHSA-qj4v-m29p-fj4m · [email protected]https://www.vulncheck.com/advisories/craft-cms-5.0.0-rc1-before-5.10.12-behavior-injection-rce · [email protected]
EPSS history
Timeline
  • 10 SEP 03:18Z
    EPSS moved — → 0%
    epss
  • 08 SEP 15:14Z
    Craft CMS 5.0.0-RC1 before 5.10.12 Behavior Injection RCE
    cvelistv5